good luck at WalMart. Check the topics "WalMart Today" and "Let's Talk About Walmart". we've been complaining and commisserating over the fact that most WalMarts are either downsizing or eliminating their fabric departments.
one of our users found this place online.
http://thousandsofbolts.com/
except for joann's and hancock fabrics clearance stuff, it has about the best prices you'll find on the internet. their regular prices are lower than most places' sale prices.