I too have been looking for a good source of fabrics. I have found some sites by searching wholesale fabric, but the real mill end outlets have eluded me. :?
You might try local interrior designers. I've been to a shop where designers resell the left-over bolt. You can find some cottons there.
I ran into a lady at a craft fair who used Ralph Lauren (designer sheeting) fabric for her woven "rag" rugs, but she wouldn't share her resource.
Ideas?
Thank you....
:D