Used saddles have the advantage of not needing a "break-in" period and the leather, provided it has been well maintained, will already be soft, supple and ready for use.
Many tack stores take used saddles on consignment and sell them at very reasonable prices. Price and fit are not the only considerations when selecting a used saddle. You also need to check the condition of the tree, the key stress points and the condition of the leather.
RESOURCES:
WWW.SADDLEMAKER.COM
WWW.SADDLEFITTER.COM
WWW.BITSANDBRIDLES.COM
WWW.BROWNSPEEDACTION.COM