In addition to the $20 off EA games, gamestop currently has a 50% trade-in bonus going on til 6/12. I traded in Black Ops for $25, got $2.50 by using my friend's rewards card, then another $12.50 from the 50% bonus, traded it straight up for Portal 2 and got one cent in store credit back. The extra 50% is store credit only, not cash.
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