I shop at Joann's pretty regularly, even though I would really rather order more interesting and higher quality fabrics on line. But using either the sales or the coupons, the fabric ends up being much cheaper there. I just wish they carried better stuff.
What drives me nuts is that they've always got some little 20% sale going on for the fabric you want, so you can't use your 40% or 50% coupon for it. You can get good bargains tho - my daughter bought me a $139 Ott Lite for like $30 over the holidays.
Joann's has pretty much obliterated the competition - the two independent quilt stores in my area (that had better fabric and knowledgeable staff) have both closed in recent times.