How much will game stop give me for these PS2 games?

you will be lucky to get 15-25 dollars for all of those games. The buyback value of games drop DRAMATICALLY. I took a copy of COD4 for ps3 in a few months back when it was still selling for USED at 54.99 and they said they could give me 20 for it. Games like you have arent even that high demand and wont sell nearly as well.