buy two, get one free special on all pre-owned products. That includes both hardware and software, so there's plenty to choose from. The sale runs through December 28. By the way, if you start your Christmas shopping after Christmas, you're really doing it wrong.
GameStop is also offering an in-store sale on the Skyrim Collector's Edition, knocking the usual $150 price down to a (slightly?) more palatable $100. Finally, you can snag Rage for $30, though we'd be remiss in our duties if we didn't mention it's currently available for just under $20 on Amazon.