if you have a business license i would contact....
www.blankshirts.com
or look for the website for a compant called "port authority" i cant infd it right now, but they are a huge supplier of blank textiles, but only business 2 business.
the heavier the weight the nicer the t-shirt. never get anything from central america, they always tend to be SHIT.
i used to work at a printing company.