Not real sure what you mean by "downtown DFW," but if you mean downtown Dallas try Cindy's. They have multiple locations, one of which is near the state courthouse in downtown Dallas. But, I think the Cindy's on Central Expressway a/k/a 75 (west side service road between Royal and Forest Lane) has better baked goods.
If that doesn't work, I have seen it at Central Market and Whole Foods. Though I am not sure if they have it currently.