My mom and sister both live in Duncanville and I am there at least once a year. This shop is about 40 minutes away but SO worth the trip- large cheerful store, lots of repro fabrics, very helpful staff- my sister teaches classes there sometimes too.
Common Threads Quilting
315 S. Rogers St
Waxahachie, TX 75165
http://www.commonthreadsquilting.com/
This one is closer but I haven't checked it out-Arlington is east of Duncanville.
http://lonestarhouseofquilts.com/