Threadless has some Black Friday savings for you, too: all T-shirts will be $9 from 12:01 am on November 27 to 11:59 pm. Everybody wears T-shirts, and this will give you a great excuse to sequester yourself away from any pesky relatives this holiday weekend. "I'll be back in an hour. Hey, do you want an Xmas present this year or not?"
The good designs and sizes tend to sell out pretty quickly, though, so you might want to hover over your computer around midnight LIKE A HAWK for maximum deal-nabbing.