The service offers differing weights of shirts. My test order was the standard weight with printing on front and back and was just under $20 for an XL. Once you go over XXL, I think the shirts cost a bit more. If the t-shirt I ordered were on Gildan, it would have been closer to $25. If the quality is sufficient, I plan to do several designs so that there will be a price range.
Also, it looks like international shipping is offered.