if you're talking car window tint..
they aren't quite in Plano, but I've used Tint World a couple times over the past few years. They aren't the cheapest option out there, but they are A+ on quality. My latest tint job by them is still going flawless almost 5 years later.
While they aren't the cheapest, the often had groupons available to knock some of the price off.
They are open on Saturdays and depending on job and business can finish in only a few hours. I went to their Grapevine location, dropped the car off, walked and grab lunch nearby, and then went to the Starbucks nearby and used their wifi to watch TV on my phone.