The best people to ask work at http://www.madshirtz.com
They do full-color direct-to-garment printing. I've used them once before. I got a t-shirt printed that had a dead cockroach on the breast like some shirts have an alligator or polo-guy. On the back was a large version of the roach with "I see dead bugs." above it. The combo of the shirt and printing on front and back was about $20... maybe $22. The front print was about 2 x 3 and the back print was about 12 x 10.
you can ask http://recommendedstore.com to print it for you, it's only $13 something but you'll get premium dtg t-shirt. they really cool man.