While the console guys have had it good this holiday, there hasn't been much in the way of PC deals other than some rare Steam discounts. The Games for Windows Marketplace has your fix now, and for only $0.99.
Every day from now through next Wednesday GFW will have a game for a buck. It was Deus Ex yesterday, and today it's Shadowrun. You may shrug and meh, but it's a freakin' dollar. What else were you going to do with that dollar?
They say to come back tomorrow for another deal. You should!