Do you have enough nerdy tee shirts for jeans days? I never have enough, but mine are a little past their primes at this point. I bought most of them years ago from CafePress. It's a pretty cool site, type in any subject or even unit you teach and you can find a variety of products, most of which are very witty, but be careful, some are inappropriate.
I can't write more, I need to shop, or at least browse