The Dallas - FW area is chock FULL of good shops ... you could shop for a week (or 2) and not see them all ... there must be 25-30 shops at least
If your time allows, check these out:
The Old Craft Store in Carrollton
Texas Quiltworks in Rockwall
The Quilt Asylum in McKinney
Quilters Dream in Colleyville
and if you love Batiks, don't miss Fabric Fanatics in Plano
Also the Cabbage Rose shop in Ft Worth
Have fun !! :)