In addition to the U.S. Postal Service, there are several sources that you can use to buy a Migratory Bird Hunting and Conservation Stamp (Duck Stamp).

Black Swamp Bird Observatory

The Black Swamp Bird Observatory in northwest Ohio regularly sells the Stamp in their effort to promote responsible birding and bird conservation.

Wisconsin Society for Ornithology

The Wisconsin Society for Ornithology also promotes Stamp sales and promotion.

American Birding Association

The ABA is selling the stamp, encouraging its members and friends to be counted as supporters of the Stamp’s effective conservation program. Read about the ABA’s effort, explained. Or visit http://aba.org/stamp/.

Looking for more buying options? The Duck Stamp Office gives you the rundown.

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Last link check: 16 July 2020