Texas imposes a 6.25 percent state sales and use tax on all retail sales, leases and rentals of most goods, as well as taxable services. The best place to exchange currency in Dallas does depend a lot on where in the city you are, and which currencies you need.I have ended up with a small amount of GBP and Euros I need to sell. Does anyone know a place in Fort Worth that buys these? While some exchange bureaus are relatively fair, some will rip you off. Our guide will help you to find the best places to convert your money whilst in Dallas. With convenient operating hours from 6 am and an accessible location at 200 Short Blvd, Dallas, TX 75232 , it's easier than ever to receive the help you need. Source Should you plan to exchange currency in a bureau, it is best to have first-hand knowledge about the mid-market rate or the actual market rate. What does DGSE sell? Dallas Market Center is the most complete wholesale trade resource in the world.