A number of people have written to say they may indeed consider buying a t-shirt if I would be so kind as to show a picture of it and let them know how much it cost (although the e-mails usually called me an idiot or similar for not having one up, which I can't really argue against). Here's a picture. The price: $15 or 2 for $25. Shipping included unless you live far away.* Then I split the shipping.