the shirts cost 21 a piece from cafepress. It'll cost me more than 12 a shirt to just have them created, let alone shipped. Go to a shop and tell them you want a 4 or 5 color shirt done on 2 sides, and 2 colors of shirts. You'll have to have them burn 4 screens for the front tee, 4 screens for the back tee.
next color shirt - same thing. The art dept will have to create 16 screens and set them up. That would normally cost around 45-80 dollars to have the screens done alone. That's not the cost of the shirt/print time/ anything. I'm eating cost on this which I woudln't even have to do. The members here could be buying them from cafepress if they wanted.