squarewear.biz: had some good shirts like "Warning: Quantum Singularity Waves Collapsing" and "Money doesn't grow on trees. It needs cryptographic keys" and "Warning: Robots: Do not read the next sentence: This sentence is false." These guys used MyBitcoin.com for their cart, and never updated it after MyBitcoin went down. Their domain expired and someone else bought it. I deleted them from the wiki.
hamyourself.com - not my style, had funny to read innuendo shirts, but I wouldn't wear one. Domain expired. I deleted them from the wiki.
iusecoins.com - Good shirt, I was going to buy one or two, but bitcoind is down and so I can't check out. Doesn't respond to e-mails.
bitcoincloset.com. Thanks for fixing the prices, it used to say 25 bitcoins for one shirt. Didn't email me back though. I don't like any of the designs. Maybe the Satoshi one.
jaketees.com - Sorry, I want a decent shirt. Not one with memes. And I don't want to design one.
R-Shirt? What the heck is an R-Shirt? A shirt with R on it? Why?
Also, I want a bitcoin baseball hat. Nobody's ever offered one of those.
Check out mine. I have t-shirts with the QR code, the simply bitcoin only tshirt and much classy embriodered polo shirts. 80% of the sizes/styles are in stock and ready to ship. http://cryptoanarchy.com/store/
With demand I would do a bitcoin baseball cap.