All those are great but here are some of my other favorites:

5bucksayard.com or Hancock's have the best prices right now. Don't ignore your local thrift stores... they sometimes have great fabric. Estate sales, too. shopgoodwill.com also has occasional fabric prices and variety that make me seriously consider bidding for lots. The online store that tends to get most of my money is: http://www.overrainbow.com/cgi-bin/Store/store.cgi If you have something particular in mind to purchase, try quiltshops.com to get a variety of stores and their prices.

The stash process is always fun!

Connecting Threads has a decent selection of solids and blenders, and their prices are hard to beat.

They have free shipping at $50.

Craftsy also has some great deals in their quilting supplies - clearance section. Fossil Fern blenders are beautiful and on clearance right now for about $5/yd depending on how many yards you get which is fantastic. They also have free shipping if you hit $100, which I'm sad (and glad?) to say I've taken advantage of before!

Best fabric buys online.
 

Marshalldrygoods.com

I should mention that Fabricshack is still running their free shipping for orders over $25 (for a non-disclosure period of time) and Thousands of Bolts has a flat rate $4.95 shipping deal until Friday.

I agree with Connecting Threads...great prices and many choices. Fabric.com is okay but I received some really stiff (almost waxy) fabric in my order that I was not completely satisfied with.

Connecting Threads is one of the first places I always go to. $5 Bucks A Yard, A Thousand Bolts ... Don't be in a rush. Shop around. There should be some good sales coming up for the 4th.

WOW, this is a wealth of info, thanks all.

I live Craftsy clearance fabrics They have up to date fabrics at great prices.