besides this site, one can post a "wanted" on these sites:
www.missingfabrics.com
www.fabrics.net
www.rjrfabrics.com
www.ladybuttonfabrics.com
www.all-about-fabrics.com
www.cranstonvillage.com
On the rjrfabrics.com, click on "fabrics" and go from there
cranstonvillage - one has to sign up
missingfabrics.com and fabrics.net are great sites