My favorite eBay fabric seller carries over 100 108" wide fabrics, including marbles and tie-dyes, WOW, tone-on-tones, antique-looking prints on natural and tan.
At $8-10/yd, the wide backings do, indeed save money over the 44-45" wide fabrics, which run $6-7/yd in her store. I buy my WOW prints in this width because I use them so much.
She doesn't sell junky stuff, either - her fabrics are very nice quality for the price. :)
http://stores.ebay.com/QUILT-UNIQUE-...=p4634.c0.m322