might not be much use but depends what quality your after. i can get them done as cheap as 0.02 BTC per shirt or 0.05 for heavy thick shirts or even hoddys and jackets.
im in the UK so would help if i knew where you where
I'm looking for the softer material. Not cheap Gildan shirts. (: I'm in the US. Let me know if you'd be able to help out.