I'm a regular at Quilters Connection in North Dallas. Small store but a good variety of fabrics and the ladies are very nice.
Not too far from there (about 15 minutes away), in Garland is Suzy's. Suzy's has a lot of Thimbleberries, CW, 30's, and a good selection of other stuff too.
There's a new store called "City Craft" near Downtown Dallas. It has a wide selection of "modern" fabrics like Kaffe Fassett and Amy Butler.
If you have a wholesale license there is the United Notions store over near Las Colinas.
And one of my favorite places is a fabric warehouse on Harry Hines called "Golden D'or"