Check with your local sign shops, you should be able to find one that has the printer, then it's just a matter of inquiring about the material.
Some sign shops won't touch the garment market, most have their hands in a little bit of everything though and will offer simple print/cut solutions and will probably have solutions opaque or another similar type of material on hand. Some sign shops will actually do screen printing for both shirts and signs as well though.
Some sign shops won't touch the garment market, most have their hands in a little bit of everything though and will offer simple print/cut solutions and will probably have solutions opaque or another similar type of material on hand. Some sign shops will actually do screen printing for both shirts and signs as well though.