fabric.com has great sales, and an everythings $1.95 department; i have been buying fabric from them for over 10 years and have had great luck, had great deals. they offer free shipping for order's over $35 which is easy to reach (it's like getting an extra yard or more free :)
if you sign up for the fabshophop on line you will have a list of something like 180 different quilt shops around the country...great way to find new resources.