I'm not an accountant, but I'm pretty sure that if you give them to charity, you should be able to deduct the value that GameStop *sells* the used consoles for. You would save 25-28% (depending on your tax bracket) of that value on your taxes.
Of course, going that route you won't actually see the money until you get your rebate next spring, but this way you get to help someone other than GameStop.
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