so far so good. I have 2 places where I purchase from the most, both have very,very good customer service, shipping is fair and order comes quickly..
1 is Fabric.com
2 is AAA quilters supply.com (fabric backs are quite resonably priced too)
I have also ordered from Olde America Antiques (great place they have all sorts of things from the past.. the woman there is a quilter and they can reproduce whatever you wish, in various sizes. Wonderful, wonderful
I have also shopped a few ebay places