feline fanatic

For fabrics:

http://www.thousandsofbolts.com/

Great sales, so check out the websales pages:
http://www.hancocks-paducah.com/SubC...Fabric--m-4825

You can browse by price, theme, manufacturer. etc.

http://www.whittlesfabrics.com/

http://www.quiltingcotton.com/

For notions, books, batting and thread
http://www.connectingthreads.com/Quilting.cfm

Those should be a good start. Many here also like
http://www.fabric.com/