About us. TNT Shirts is a small business in Houston, TX. We are professional, agile, customer-centric and our goal is to 35 Years of Houston Service Growing from one manual carousel in 1983 to multiple, fully automated carousels for screen printing and embroidery machines in 2018, TNT Shirts strives to be the most price competitive, best equipped and quality driven print shop in Greater Houston. State of the art machinery, dedicated professionals...