Ok dave here are a couple of places
1st one is
From Embroidery to Commercial Signs, Innovative Designs has the best customer service in San Antonio, Texas. they are located on the NW side on 5025 Timberhill # 103 San Antonio, TX 78238 (behind Ingram park mall). I had them do the side stripes on my v6. Really quality work. I had them on for over a year and still looked like the day i bought them. I havent been over there in a while though so im not sure on their prices anymore.
2nd place is
Edmar Stickers - San Antonio, Texas they are located on the North Central on Perrin Beital. They are the one who will be doing work on the GT. Havent had any work done since i cant find the time, however i have been by their shop and seen their work.