A lot of people look for decoys at auction sites and get deals that don't come by too often and also paying way less than you can amagine depending on how bad someone wants that certain decoy. Below you can  check out a few of the decoy auctions that go on at different times of the year. check them out and get in on their mailing list and you may be able to get hold of that certain decoy you have been looking for.
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Neil's Auction Company

Frank & Frank Sporting Collectables LLC

Guyette, Schmidt & Deeter

Copely Fine Arts Auctions