I have to second the reccomendation for Lone Star House of Quilts. I've never purchased online from them, though I'm sure they're great that way, I've just been in the store many times. I can't tell you how much I love that store! Very friendly staff, amazing selection of fabrics and good prices. All summer long they ran a sale of 25% off all fabric of 1/2 yard cut or more. If you get on their email list they send out sale info for online shopping all the time.
I've ordered once from thepatchworkco.com and was happy with my order. They have a really big selection of 30's fabric but have quite a few Civil War repro's as well. Price is average.