How much store credit would I get for these games at gamestop?

First off, GO TO BEST BUY THEY ARE AMAZING!!!!

Ok now that I got that out, individually:

Gears of War 3- $20

Modern Warfare 3- $15

Ghost Recon: Future Soldier-$25

NHL 12- $8

That's the best buy value. For GameStop I would think you would probably subtract 20%.

Too little to be worth it. Gamestop gives you waaaayyy too little money, better sell it off somewhere else or give it to someone; it will make them more happy then the little money you would get would make you.

$40