Connecting Threads, Christa Quilts weekly bargains, Pieceworks, Fabric Depot, Fabric.com, Nixie Chicks, Homespun Hearth...
There are a lot of deals if you sign up for free emails/newsletters. They will notify you when there is a sale, a clearance, etc. You can do this while you shop hop or just looking up quilt shops in Google, etc.
Also, my local fabric shop takes Joann's coupons for one non-sale item each visit.