How much will gamestop pay for these games and stuff (and their used)???

Well I went to gamestop and they are cheap as hell Look it also depends on the game and it's condition they would pay me 6 bucks for spiderman 3 then i went to gamecrazy they would buy it from me for 7 Dollars so For you i guess at gamestop at least 300 - 450 dollars.I would go to EB Games i havent checked but that's were i would go to see.Hope this info helps bye.