There are smaller stores scattered around the DFW area that have great bottle selections. In Flower Mound, for example, there's a gas station on Morriss Rd. that has over 100 different craft beers in bottles/cans. I imagine there are places like that in other parts of the area, too.
Some grocery stores have good selections, some don't. Central Market, Whole Foods, and Market Street will normally be safe bets for stuff like Lakewood, Community and Deep Elum beers.
It all really depends on which part of the area you're going to be in. It's a very large area!