Here some trade-in values from this weekend:
[These are all for Xbox 360]
Disney Universe - $8
Batman: Arkham City (vanilla) - $10
The Darkness 2 - $10
Left 4 Dead: GOTY Ed. - $14
LEGO Batman 2 - $15
Only disappointing trade was LEGO Batman 2, which went down $5 since the last update just before the end of August. I should have traded that one to Best Buy and gotten an extra $3, but considering what a pain in the ass trading games to my local BB is, I'm fine giving my games to GS instead.