Aully

http://www.marshalldrygoods.com/ They are my favourite, they also have an ebay store. :)
http://www.cottoncharm.com/servlet/StoreFront They have great customer servise, I have ordered here a few times.
http://www.fabric.com/
http://www.bugfabric.com/index.htm
http://www.fabricshack.com/cgi-bin/Store/store.cgi not sure if the have paypal?
http://www.fabricandwoodideas.com/