Aargh. I said "at the show" because that's the obvious place to find shirts, especially from bands that aren't mainstream indie. Otherwise, go to their website, and maybe you'll find shirts there. Or design your own and either screenprint them or stencil and spraypaint them. Ebay, of course, is that last resort that you really shouldn't use if you have any self-respect, but you might might MIGHT find a shirt on there occasionally.
Hmm.
As for concerts and such, maybe we could set up some sort of thing where we can pick up shirts for each other at concerts we go to. I mean, if someone sent me enough cash to buy a shirt and send it to them, I'd have no problem picking them up a shirt at a show and sending them back the change. Since we already have an upcoming shows thread, we could really easily work that in.
Interest anyone?