How much store credit would I receive by selling Black Ops and Crysis 2 for xbox 360 at gamestop?

it's 2 good games and if they are in good condition with no/minor scratches,30-40$ for each game.How much store credit would I receive by selling Black Ops and Crysis 2 for xbox 360 at gamestop?
Don't sell them to Gamestop. They give you less that 50% of original price for new games. Sell them to a person, and you can get 45-50 dollars out of them easy.How much store credit would I receive by selling Black Ops and Crysis 2 for xbox 360 at gamestop?
Probably 50 for both

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