Chicago-based Threadless is having a $10 "Spring Broke" tee shirt sale, making now the perfect time to stock up on tees you won't see anyone else wearing. I love the Threadless business model: let anyone who wants to design a tee shirt, ask the public to vote for their favorite, and print up limited runs of winning designs on high-quality tees.
Personally, I've got my eye on Nineteen Seventy Five.