As much as I hate GS, these are probably the best prices they've given for some of these GBA games. It wouldn't surprise me that they're trying to lower the quantity of GBA games they have, either. Even if the DS is backwards compatible. Though I gotta say...good luck actually finding some of these in stock.
$1.99
$2.99
$3.99
$4.99
$5.99
$6.99
$7.99
$8.99
$9.99
$12.99
$14.99
$16.99
$1.99
$2.99
GameCube Game Boy Advance Cable (Nintendo brand)
http://www.gamestop.com/product.asp?product%5Fid=900513
Pinball of the Dead, The
http://www.gamestop.com/product.asp?product%5Fid=914269
Zone of the Enders: The Fist of Mars
http://www.gamestop.com/product.asp?product%5Fid=914182
http://www.gamestop.com/product.asp?product%5Fid=900513
Pinball of the Dead, The
http://www.gamestop.com/product.asp?product%5Fid=914269
Zone of the Enders: The Fist of Mars
http://www.gamestop.com/product.asp?product%5Fid=914182
$3.99
ChuChu Rocket!
http://www.gamestop.com/product.asp?product%5Fid=914059
FirePro Wrestling
http://www.gamestop.com/product.asp?product%5Fid=914056
Lady Sia
http://www.gamestop.com/product.asp?product%5Fid=914016
Sabre Wulf
http://www.gamestop.com/product.asp?product%5Fid=914596
Ultimate Muscle: The Path of the Superhero
http://www.gamestop.com/product.asp?product%5Fid=914447
Xevious
http://www.gamestop.com/product.asp?product%5Fid=914610
http://www.gamestop.com/product.asp?product%5Fid=914059
FirePro Wrestling
http://www.gamestop.com/product.asp?product%5Fid=914056
Lady Sia
http://www.gamestop.com/product.asp?product%5Fid=914016
Sabre Wulf
http://www.gamestop.com/product.asp?product%5Fid=914596
Ultimate Muscle: The Path of the Superhero
http://www.gamestop.com/product.asp?product%5Fid=914447
Xevious
http://www.gamestop.com/product.asp?product%5Fid=914610
$4.99
Advance Guardian Heroes
http://www.gamestop.com/product.asp?product%5Fid=914667
Astro Boy: Omega Factor
http://www.gamestop.com/product.asp?product%5Fid=914639
Banjo-Kazooie: Grunty's Revenge
http://www.gamestop.com/product.asp?product%5Fid=914477
Boktai: The Sun is in Your Hands
http://www.gamestop.com/product.asp?product%5Fid=914480
Earthworm Jim
http://www.gamestop.com/product.asp?product%5Fid=914050
Earthworm Jim 2
http://www.gamestop.com/product.asp?product%5Fid=914291
Final Fight One
http://www.gamestop.com/product.asp?product%5Fid=914084
F-Zero GP Legend
http://www.gamestop.com/product.asp?product%5Fid=914670
Game & Watch Gallery 4
http://www.gamestop.com/product.asp?product%5Fid=914356
Gunstar Super Heroes
http://www.gamestop.com/product.asp?product%5Fid=914852
Ice Climber
http://www.gamestop.com/product.asp?product%5Fid=914601
It's Mr. Pants
http://www.gamestop.com/product.asp?product%5Fid=914767
Jet Grind Radio
http://www.gamestop.com/product.asp?product%5Fid=914460
Klonoa 2: Dream Championship Tournament
http://www.gamestop.com/product.asp?product%5Fid=914753
Mega Man & Bass
http://www.gamestop.com/product.asp?product%5Fid=914036
Ninja Five-O
http://www.gamestop.com/product.asp?product%5Fid=914432
Puyo Pop
http://www.gamestop.com/product.asp?product%5Fid=914177
River City Ransom EX
http://www.gamestop.com/product.asp?product%5Fid=914588
R-Type III
http://www.gamestop.com/product.asp?product%5Fid=914555
Scurge: Hive
http://www.gamestop.com/product.asp?product%5Fid=915013
Sigma Star Saga
http://www.gamestop.com/product.asp?product%5Fid=914803
Space Channel 5: Ulala's Cosmic Attack
http://www.gamestop.com/product.asp?product%5Fid=914451
Super Bust-a-Move
http://www.gamestop.com/product.asp?product%5Fid=914135
Super Ghouls 'n Ghosts
http://www.gamestop.com/product.asp?product%5Fid=914326
http://www.gamestop.com/product.asp?product%5Fid=914667
Astro Boy: Omega Factor
http://www.gamestop.com/product.asp?product%5Fid=914639
Banjo-Kazooie: Grunty's Revenge
http://www.gamestop.com/product.asp?product%5Fid=914477
Boktai: The Sun is in Your Hands
http://www.gamestop.com/product.asp?product%5Fid=914480
Earthworm Jim
http://www.gamestop.com/product.asp?product%5Fid=914050
Earthworm Jim 2
http://www.gamestop.com/product.asp?product%5Fid=914291
Final Fight One
http://www.gamestop.com/product.asp?product%5Fid=914084
F-Zero GP Legend
http://www.gamestop.com/product.asp?product%5Fid=914670
Game & Watch Gallery 4
http://www.gamestop.com/product.asp?product%5Fid=914356
Gunstar Super Heroes
http://www.gamestop.com/product.asp?product%5Fid=914852
Ice Climber
http://www.gamestop.com/product.asp?product%5Fid=914601
It's Mr. Pants
http://www.gamestop.com/product.asp?product%5Fid=914767
Jet Grind Radio
http://www.gamestop.com/product.asp?product%5Fid=914460
Klonoa 2: Dream Championship Tournament
http://www.gamestop.com/product.asp?product%5Fid=914753
Mega Man & Bass
http://www.gamestop.com/product.asp?product%5Fid=914036
Ninja Five-O
http://www.gamestop.com/product.asp?product%5Fid=914432
Puyo Pop
http://www.gamestop.com/product.asp?product%5Fid=914177
River City Ransom EX
http://www.gamestop.com/product.asp?product%5Fid=914588
R-Type III
http://www.gamestop.com/product.asp?product%5Fid=914555
Scurge: Hive
http://www.gamestop.com/product.asp?product%5Fid=915013
Sigma Star Saga
http://www.gamestop.com/product.asp?product%5Fid=914803
Space Channel 5: Ulala's Cosmic Attack
http://www.gamestop.com/product.asp?product%5Fid=914451
Super Bust-a-Move
http://www.gamestop.com/product.asp?product%5Fid=914135
Super Ghouls 'n Ghosts
http://www.gamestop.com/product.asp?product%5Fid=914326
$5.99
F-Zero: Maximum Velocity
http://www.gamestop.com/product.asp?product%5Fid=914067
Klonoa: Empire of Dreams
http://www.gamestop.com/product.asp?product%5Fid=914087
Robotech: The Macross Saga
http://www.gamestop.com/product.asp?product%5Fid=914347
Sega Arcade Gallery
http://www.gamestop.com/product.asp?product%5Fid=914440
http://www.gamestop.com/product.asp?product%5Fid=914067
Klonoa: Empire of Dreams
http://www.gamestop.com/product.asp?product%5Fid=914087
Robotech: The Macross Saga
http://www.gamestop.com/product.asp?product%5Fid=914347
Sega Arcade Gallery
http://www.gamestop.com/product.asp?product%5Fid=914440
$6.99
FirePro Wrestling 2
http://www.gamestop.com/product.asp?product%5Fid=914331
Mega Man Battle Network 2
http://www.gamestop.com/product.asp?product%5Fid=914266
Super Monkey Ball Jr.
http://www.gamestop.com/product.asp?product%5Fid=914396
Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel
http://www.gamestop.com/product.asp?product%5Fid=914430
http://www.gamestop.com/product.asp?product%5Fid=914331
Mega Man Battle Network 2
http://www.gamestop.com/product.asp?product%5Fid=914266
Super Monkey Ball Jr.
http://www.gamestop.com/product.asp?product%5Fid=914396
Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel
http://www.gamestop.com/product.asp?product%5Fid=914430
$7.99
Drill Dozer
http://www.gamestop.com/product.asp?product%5Fid=914912
Game Boy Advance SP AC Adaptor
http://www.gamestop.com/product.asp?product%5Fid=900580
Golden Sun
http://www.gamestop.com/product.asp?product%5Fid=914142
Lunar Legend
http://www.gamestop.com/product.asp?product%5Fid=914415
Mega Man Battle Network 4: Blue Moon
http://www.gamestop.com/product.asp?product%5Fid=914619
Mega Man Battle Network 4: Red Sun
http://www.gamestop.com/product.asp?product%5Fid=914615
Mega Man Battle Network 5: Team Protoman
http://www.gamestop.com/product.asp?product%5Fid=914785
Metroid
http://www.gamestop.com/product.asp?product%5Fid=914713
Shining Force: Resurrection of the Dark Dragon
http://www.gamestop.com/product.asp?product%5Fid=914604
Tales of Phantasia
http://www.gamestop.com/product.asp?product%5Fid=914924
http://www.gamestop.com/product.asp?product%5Fid=914912
Game Boy Advance SP AC Adaptor
http://www.gamestop.com/product.asp?product%5Fid=900580
Golden Sun
http://www.gamestop.com/product.asp?product%5Fid=914142
Lunar Legend
http://www.gamestop.com/product.asp?product%5Fid=914415
Mega Man Battle Network 4: Blue Moon
http://www.gamestop.com/product.asp?product%5Fid=914619
Mega Man Battle Network 4: Red Sun
http://www.gamestop.com/product.asp?product%5Fid=914615
Mega Man Battle Network 5: Team Protoman
http://www.gamestop.com/product.asp?product%5Fid=914785
Metroid
http://www.gamestop.com/product.asp?product%5Fid=914713
Shining Force: Resurrection of the Dark Dragon
http://www.gamestop.com/product.asp?product%5Fid=914604
Tales of Phantasia
http://www.gamestop.com/product.asp?product%5Fid=914924
$8.99
Sonic Pinball Party
http://www.gamestop.com/product.asp?product%5Fid=914455
http://www.gamestop.com/product.asp?product%5Fid=914455
$9.99
Advance Wars
http://www.gamestop.com/product.asp?product%5Fid=914093
Castlevania: Circle of the Moon
http://www.gamestop.com/product.asp?product%5Fid=914068
Double Dragon
http://www.gamestop.com/product.asp?product%5Fid=914533
Dragon Ball Z: Legacy of Goku II
http://www.gamestop.com/product.asp?product%5Fid=914450
Lufia: The Ruins of Lore
http://www.gamestop.com/product.asp?product%5Fid=914433
Mega Man Battle Network
http://www.gamestop.com/product.asp?product%5Fid=914118
Mega Man Battle Network 5: Team Colonel
http://www.gamestop.com/product.asp?product%5Fid=914784
Mega Man Zero
http://www.gamestop.com/product.asp?product%5Fid=914316
Mega Man Zero 2
http://www.gamestop.com/product.asp?product%5Fid=914494
Mega Man Zero 3
http://www.gamestop.com/product.asp?product%5Fid=914691
Metroid Fusion
http://www.gamestop.com/product.asp?product%5Fid=914391
Metroid Zero Mission
http://www.gamestop.com/product.asp?product%5Fid=914560
One Piece
http://www.gamestop.com/product.asp?product%5Fid=914813
Onimusha Tactics
http://www.gamestop.com/product.asp?product%5Fid=914504
Phantasy Star Collection
http://www.gamestop.com/product.asp?product%5Fid=914399
Riviera: The Promised Land
http://www.gamestop.com/product.asp?product%5Fid=914787
Shining Soul
http://www.gamestop.com/product.asp?product%5Fid=914478
Shining Soul 2
http://www.gamestop.com/product.asp?product%5Fid=914583
Street Fighter Alpha 3
http://www.gamestop.com/product.asp?product%5Fid=914193
Super Puzzle Fighter II
http://www.gamestop.com/product.asp?product%5Fid=914046
Super Robot Taisen: Original Generation 2
http://www.gamestop.com/product.asp?product%5Fid=915036
Sword of Mana
http://www.gamestop.com/product.asp?product%5Fid=914545
Wario Land 4
http://www.gamestop.com/product.asp?product%5Fid=914159
Wario Ware, Inc.: Mega Micro Game$
http://www.gamestop.com/product.asp?product%5Fid=914442
http://www.gamestop.com/product.asp?product%5Fid=914093
Castlevania: Circle of the Moon
http://www.gamestop.com/product.asp?product%5Fid=914068
Double Dragon
http://www.gamestop.com/product.asp?product%5Fid=914533
Dragon Ball Z: Legacy of Goku II
http://www.gamestop.com/product.asp?product%5Fid=914450
Lufia: The Ruins of Lore
http://www.gamestop.com/product.asp?product%5Fid=914433
Mega Man Battle Network
http://www.gamestop.com/product.asp?product%5Fid=914118
Mega Man Battle Network 5: Team Colonel
http://www.gamestop.com/product.asp?product%5Fid=914784
Mega Man Zero
http://www.gamestop.com/product.asp?product%5Fid=914316
Mega Man Zero 2
http://www.gamestop.com/product.asp?product%5Fid=914494
Mega Man Zero 3
http://www.gamestop.com/product.asp?product%5Fid=914691
Metroid Fusion
http://www.gamestop.com/product.asp?product%5Fid=914391
Metroid Zero Mission
http://www.gamestop.com/product.asp?product%5Fid=914560
One Piece
http://www.gamestop.com/product.asp?product%5Fid=914813
Onimusha Tactics
http://www.gamestop.com/product.asp?product%5Fid=914504
Phantasy Star Collection
http://www.gamestop.com/product.asp?product%5Fid=914399
Riviera: The Promised Land
http://www.gamestop.com/product.asp?product%5Fid=914787
Shining Soul
http://www.gamestop.com/product.asp?product%5Fid=914478
Shining Soul 2
http://www.gamestop.com/product.asp?product%5Fid=914583
Street Fighter Alpha 3
http://www.gamestop.com/product.asp?product%5Fid=914193
Super Puzzle Fighter II
http://www.gamestop.com/product.asp?product%5Fid=914046
Super Robot Taisen: Original Generation 2
http://www.gamestop.com/product.asp?product%5Fid=915036
Sword of Mana
http://www.gamestop.com/product.asp?product%5Fid=914545
Wario Land 4
http://www.gamestop.com/product.asp?product%5Fid=914159
Wario Ware, Inc.: Mega Micro Game$
http://www.gamestop.com/product.asp?product%5Fid=914442
$12.99
Advance Wars 2: Black Hole Rising
http://www.gamestop.com/product.asp?product%5Fid=914456
Breath of Fire
http://www.gamestop.com/product.asp?product%5Fid=914170
Breath of Fire II
http://www.gamestop.com/product.asp?product%5Fid=914238
Disney's Aladdin
http://www.gamestop.com/product.asp?product%5Fid=914680
Dr. Mario
http://www.gamestop.com/product.asp?product%5Fid=914714
Dr. Mario + Puzzle League
http://www.gamestop.com/product.asp?product_id=914895
Dragon Ball Z: Buu's Fury
http://www.gamestop.com/product.asp?product%5Fid=914664
Golden Sun: The Lost Age
http://www.gamestop.com/product.asp?product%5Fid=914428
Mario & Luigi: Superstar Saga
http://www.gamestop.com/product.asp?product%5Fid=914537
Mario Pinball Land
http://www.gamestop.com/product.asp?product%5Fid=914684
Mario Tennis: Power Tour
http://www.gamestop.com/product.asp?product%5Fid=914897
Naruto: Ninja Council 2
http://www.gamestop.com/product.asp?product%5Fid=915002
Pokémon Pinball Ruby & Sapphire
http://www.gamestop.com/product.asp?product%5Fid=914470
Sonic Advance/Pinball Party Double Pack
http://www.gamestop.com/product.asp?product%5Fid=914896
Sonic Advance 3
http://www.gamestop.com/product.asp?product%5Fid=914603
Summon Knight: Swordcraft Story 2 (Was: $14.99)
http://www.gamestop.com/product.asp?product%5Fid=915006
Yggdra Union (Was: $17.99)
http://www.gamestop.com/product.asp?product%5Fid=915024
http://www.gamestop.com/product.asp?product%5Fid=914456
Breath of Fire
http://www.gamestop.com/product.asp?product%5Fid=914170
Breath of Fire II
http://www.gamestop.com/product.asp?product%5Fid=914238
Disney's Aladdin
http://www.gamestop.com/product.asp?product%5Fid=914680
Dr. Mario
http://www.gamestop.com/product.asp?product%5Fid=914714
Dr. Mario + Puzzle League
http://www.gamestop.com/product.asp?product_id=914895
Dragon Ball Z: Buu's Fury
http://www.gamestop.com/product.asp?product%5Fid=914664
Golden Sun: The Lost Age
http://www.gamestop.com/product.asp?product%5Fid=914428
Mario & Luigi: Superstar Saga
http://www.gamestop.com/product.asp?product%5Fid=914537
Mario Pinball Land
http://www.gamestop.com/product.asp?product%5Fid=914684
Mario Tennis: Power Tour
http://www.gamestop.com/product.asp?product%5Fid=914897
Naruto: Ninja Council 2
http://www.gamestop.com/product.asp?product%5Fid=915002
Pokémon Pinball Ruby & Sapphire
http://www.gamestop.com/product.asp?product%5Fid=914470
Sonic Advance/Pinball Party Double Pack
http://www.gamestop.com/product.asp?product%5Fid=914896
Sonic Advance 3
http://www.gamestop.com/product.asp?product%5Fid=914603
Summon Knight: Swordcraft Story 2 (Was: $14.99)
http://www.gamestop.com/product.asp?product%5Fid=915006
Yggdra Union (Was: $17.99)
http://www.gamestop.com/product.asp?product%5Fid=915024
$14.99
Bubble Bobble: Old & New
http://www.gamestop.com/product.asp?product%5Fid=914678
Donkey Kong: King of Swing
http://www.gamestop.com/product.asp?product%5Fid=914817
Mega Man Zero 4
http://www.gamestop.com/product.asp?product%5Fid=914832
Metal Slug Advance
http://www.gamestop.com/product.asp?product%5Fid=914638
Summon Knight: Swordcraft Story
http://www.gamestop.com/product.asp?product%5Fid=914955
Super Robot Taisen: Original Generation
http://www.gamestop.com/product.asp?product%5Fid=914962
Yoshi's Island: Super Mario Advance 3
http://www.gamestop.com/product.asp?product%5Fid=914323
http://www.gamestop.com/product.asp?product%5Fid=914678
Donkey Kong: King of Swing
http://www.gamestop.com/product.asp?product%5Fid=914817
Mega Man Zero 4
http://www.gamestop.com/product.asp?product%5Fid=914832
Metal Slug Advance
http://www.gamestop.com/product.asp?product%5Fid=914638
Summon Knight: Swordcraft Story
http://www.gamestop.com/product.asp?product%5Fid=914955
Super Robot Taisen: Original Generation
http://www.gamestop.com/product.asp?product%5Fid=914962
Yoshi's Island: Super Mario Advance 3
http://www.gamestop.com/product.asp?product%5Fid=914323
$16.99
Castlevania Double Pack (Harmony of Dissonance + Aria of Sorrow)
http://www.gamestop.com/product.asp?product%5Fid=914901
http://www.gamestop.com/product.asp?product%5Fid=914901