Go to this site: http://www.quiltshops.com/ and type in "108 inch wide back". And if you want only those that are on sale, type SALE after the description. I just did that and got about 3 pages worth. I have purchased through these quilt shops often, and have never had any trouble with the customer service or quality.

I like Thousands of Bolts. I have bought from Fabric .com.. but twice got backings so thin , it has made me skeptical. If its fabric .com make sure a manufacture is one you know and have confidence. The ones I got from them did not list a manufacture .. lived and learned the hard way.