Orange Box looks to be a universal drop to $19.99, but if you're having trouble finding it new BestBuy.com seems to have it. Facebreaker also may be in the middle of a universal drop to $49.99, as Gamestop has the retail for $49.99 but used for $26.99. The other games seem to be reduced prices specific to the Best Buy website though.
Xbox 360
Operation Darkness $19.99
The Orange Box $19.99
Too Human $39.99
Facebreaker $29.99
PS3
Conan $9.99
The Orange Box $19.99
Facebreaker $29.99
Nintendo DS
Warhammer 40,000: Squad Command $9.99
Star Fox Command $13.99
Xbox 360
Operation Darkness $19.99
The Orange Box $19.99
Too Human $39.99
Facebreaker $29.99
PS3
Conan $9.99
The Orange Box $19.99
Facebreaker $29.99
Nintendo DS
Warhammer 40,000: Squad Command $9.99
Star Fox Command $13.99