Hi Kirk,
I created that look. I have an eps file that I can send you if you want. (Most shirt companies can/should be able to use an eps file.)
Shoot me your email and I'll send it along. (careforapint [-at-] gmail.com) Hey, if there's more interest in this, can you get a discount?
I've set up a CafePress site a while ago for some goodies:
http://www.cafepress.com/camra