I was thinking about selling my guitar hero 3 for the ps2 to gamestop?

May be...

SO right now I have 2 guitar hero 3 games, each with its own box and 2 ps2 guitar hero 3 controllers. I know Gamestop is pretty bad at giving you a good commission but I was wondering how much do you think they would give me for all of those.

They gave me 40 for 1 guitar hero 3 game with controller. I would say $100 though because you have 2.

go on craigslist.org and sell them both for $50 a piece. gamestop is nothing short of a rip off

ask them, then if it's too little, try ebay