I came across a new site recently called RetroFootballTshirts.com that you may want to check out. The site features irreverant shirt designs for many famous football clubs and legends (such as Peter Osgood and Bill Shankly).
No shipping is available to the United States right now, but if you’re in Europe, the company ships to a long list of countries (detailed on homepage, right column).
Check the site out when you get a chance.
Thanks to 101greatgoals for the tip regarding this new site.