I highly recommend crazyquiltgirlfabricshop.com. She has excellent prices and fast shipping (and not too expensive).
I needed to get some Moda Park Avenue fabric to finish a lap quilt for my friend. I have the top all done (using a jelly roll)but needed the backing fabric. My LQS carries mostly Moda so I went there this morning but they didn't have this particular one. When I got home I went to crazyquiltgirl web because that's where I bought the Jelly Roll and her yardage fabric for this was $7.50/yd. compared to other webs that were $8.99 and $9.50/yd. I ordered what I needed today.
I like to try to get as much as I can from my LQS but they don't always have what I need so I have to look elsewhere.
Another place I like is greenfairyquilts.com. I just got an order from them today :)