Here's what I got so far:
GB: Gauntlet II (used) - $1.50 (Gamestop)
GB: Mega Man Xtreme 2 (used) - $1.50 (GS)
GBC: Lufia: The Legend Returns (used) - $1.50 (GS)
GBC: Mega Man: Dr. Wily's Revenge (used) - $1.50 (GS)
GBC Pokemon Crystal (used) - $2.55 (Gamestop)
PSX: Wild Arms 2 (used) - $18.99 (eBay w/cashback)
Izuna 2: The Unemployed Ninja Returns (new) - $14.98 (Amazon)
Summon Night: Twin Age - $14.22 (Amazon)
Trauma Center: Under the Knife 2 (new) - $14.96 (Amazon)
God Hand (used) - $7.79 (Gamestop)
Growlanser Generations (used) - $11.99 (Gamestop)
Grandia III (used) - $11.99 (Gamestop)
Magna Carta: Tears of Blood (used) - $11.99 (Gamestop)
Makai Kingdom (new) - $11.99 (Amazon)
Phantom Brave (used) - $5.99 (Gamestop)
Silent Hill 3 (used) - $9.99 (BBV)
Steambot Chronicles (new) - $9.99 (Gamestop)
Stella Deus (used) - $7.79 (Gamestop)
Wizardry: Tale of the Forsaken Land (used) - $5.99 (Gamestop)
Ys: The Ark of Napishtim (used) - $7.79 (Gamestop)
Edit - Forgot Summon Night