In addition to many of the shops mentioned here, I have also ordered from stitchin heaven (www.stitchinheaven.com). They have always been very helpful and friendly with quick shipping.

I have purchased from both keepsake quilting and connecting threads...very nice quality with both!!!

try fabric4less.com

I do a lot of online shopping and have never had a problem. eQuilter.com is my favorite because they have such a large selection. They also have some wonderful sales. Each week, something is on sale. I also shop at Fabrics of Joy and Big Horn Quilts. Contemporary Fabric is also good.

I like fabric depot, stitch n frame, old country store.

Haven't read more than a few responses but for me Hands Down is Connecting Threads. Love the feel, love the fat quarters, which are usually more than that and when you buy a kit from them there is almost enough to make two of! I love their sales as well!

I've used
www.webfabrics.net
www.deltapatchwork.com
www.favoritefabrics.com
www.hancocks-paducah.com
www.batikplus.com
www.bearcreekquilting.com
www.clotilde.com
www.kayewood.com
www.nancysnotions.com
www.missouriquiltco.com
www.emeraldcityfabrics.com
www.keepsakequilting.com
http://www.labfabrics.com

I know there are others but can't remember.

www.connectingthreads.com

Hawthorne Threads has some really interesting fabrics, Japanese imports and designer fabrics. They have great sales and a discount for quantity, even for regular priced fabric.

I have purchased from www.ConnectingThreads.com, and been pleased with their quick delivery, and no shipping charge when you order over $50 online. Their latest catalog has selected closeout solids for $2.96 per yard, and 40% off all books. I'm trying to avoid temptation!