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GameStop has a new coupon out good for 25% off any game $9.99 and up. The code is IMPULSE-BERV-GVJF-WFOT. Expires on 9/13.
It works on pre-orders of Call of Duty: Ghosts, which makes the game $45. Requires Steam activation. Release date for the game is 11/15/13.
I’m not sure if GMG carries the game but you could hold out for a deal at their site.