I came across a link to this Missing Fabrics website yesterday, and wanted to share. It's a free quilters' service, where you can post for any fabric you want and can't find; then other quilters and quilt shops check to to see if they have any. Apparently they have a 65%-70% success rate. I've added a permanent link to it on the right; with the quilting links down the bottom.
I'm trying it out for some Paula Nadelstern Symmetry fabrics for more snowflakes. I've already had one email from someone who's going to check their shop on Monday; she thinks she has one!