IF YOU'RE INTO THAT SORTA THING...
I'm not a screenprinter, nor can I really afford to print tees on demand (or want to really)... HOWEVER
I do design tees every so often. I use Teepublic and Teefury to print/sell these. Yes, if you purchase through them they will take good care of you!... Also, I do get a commission off of every sale - so not to worry, you are still going to support the artist ;)
Links are below and will connect you externally to each site.