I got me a Leprosy shirt too (at Metalfest), but I'm afraid its a bootleg...pretty thin and the colors are funky. Oh well, its still a shirt. Not shy about brandishing that one.
www.star500.com has ONE Death tshirt. Black short sleeve with the Death logo on the front and "100% Organic Metal" all down the back in white bold letters. I haven't ordered it just because I don't really like the back print, even though it's the only Death shirt I've found available online.