Over the years I have ad a couple that got away before I could buy more of it or thought I had enough for a specific quilting project only to find I ran short. Years ago a quilting buddy of mine started a wonderful site,
http://www.missingfabrics.com to help find those lost fabrics. You would be amazed what I have in my stash that could help someone else as well as pieces I needed. It is a great place to begin your search. The hardest and best find for me was a butterfly pattern that I had. I needed about a yard. Someone had 2 yards and I swooped it up right away.