In Utah, our shop's biggest selling fabric is Shannon Cuddle (minky). We also sell a lot of baby flannel, which not a lot of other quilt shops carry. There's a quilt market survey somewhere online that discusses what people are buying. And the biggest selling fabric by far was batiks. Civil War reproduction fabrics are always a great seller, too. And anything Kim Diehl, Basic Grey, Sandy Gervais. Moda fabrics are always great quality, except for their Bella Solids. Just selling fabrics doesn't make a successful quilt shop. If we didn't sell and service sewing machines, we might not still exist. The store where I work has been in business since 1958. Good Luck with your endeavor!