Check out the site cafepress.com. I have ordered quite a few custom shirts through them and they've turned out good. I ordered a white one about 3 years ago that used an iron on process. It has survived 3 years of washing not to mention it doesn't look like an iron on at all. It had that feel to it and a slight seam at first but it dissapears after the first washing. They now do black shirts with direct printing. The colors on those aren't as accurate as the white shirts but you can still get good results. I believe they do a slight discount for bulk shirts over 15. Only problem you may have from them is copywriting/legal crap.