I love love love Cafe Press. They are awesome. For the holidays I got my sister-in-law (who is a math teacher) a Pi T-shirt (she is now the envy of all of her friends) and I got myself a very cool (if I do say so myself) Battlestar Galactica referencing T-shirt. They often have great sales and they have fantastic stock to choose from.
Well, today on DealPulp you can get a $30 certificate to Cafe Press for only $15! There is a limit of one per person, but you can buy one additional as a gift. You won’t regret it. Cafe Press is fantastic.