Try to Google
"used sails." But caveat emptor. You can find some good bargains in used sails, and some not so good ones. Pick a sail broker that will let you return the sail for a full refund (i.e. Bacons, etc.) if you don't like it or it doesn't fit. The ideal sail broker will have a sail to fit your boat and be near enough to you so that you can inspect the sail before buying or trying it.