I second everyone who suggested eBay.
Also, not sure if you said how long ago the fabrics were printed. My local quilt shop primarily stocks reproduction fabrics (Civil War & 1930's, mainly, but occasionally they'll bring back a newer line). There are both on-line and retail stores that specialize in out-of-print and reproduction fabrics. The retail quilt shops often don't advertise their lines on the web, so you have to find one that carries fabrics from that time period (or new out-of-print fabrics) and call. If they don't have it, ask for a suggestion of who to call next. They tend to be pretty well connected with one another when they carry specialty lines like that.
Good luck with your search!!!