I mentioned buying fabric online a few days ago, and Barbara asked where I buy it online. Truth be told, I've only bought a couple of charm packs from Green Fairy Quilts, so I don't have a great amount of experience in this area, but I've been doing some research and thought I'd share a few sites I've found that seem to have reasonable prices.
Online fabric shops:
fabricworm - modern quilt fabric, Japanese import fabric, home decor fabric - good prices! Most 1/2 yard cuts are $4.25, which is $8.50/yard.
Fabric.com - good prices, free shipping in the US on $35 or more order.
Above All Fabric - my favorite so far! Good prices, reasonable shipping (including shipping to Canada that doesn't cost an arm and a leg), and a great selection of fabrics.
Green Fairy Quilts - good sales, reasonable shipping
Marie-Madeleine Studio - Christian mother and sisters running their own business; love their modest patterns and good selection of fabrics
Green Fairy Quilts - again!
Jojo's Quilt and Gift Shoppe
Marie Madeleine Studio
These are just a few of the shops I've found. Obviously, I haven't even begun to scratch the surface, but hopefully they will give you an idea of where to start looking online for fabrics.