Right now we don't have a lot of variation with regard to where people get their T-Shirts done.
Looks like virtually everyone uses Cafe Press. The other obvious option is to find someone local and have a bunch of shirts made up.
Please email us if you have additional resources that could be listed here.
-- Thanks
Cafe Press -- www.cafepress.com
Zazzle -- www.zazzle.com
Uber Prints -- www.uberprints.com