Winged musket caps

First, try Wal-mart & Kmart stores.  In many sections of the country you can purchase these "over the counter".  Many gun shops carry them, especially those carrying musket & black powder supplies.  Musket caps are made by different manufacturers.  One is CCI (now called ATK), another is Naval Arms Co.

This link will help you locate a dealer near you:   http://cci-ammunition.com
Blockade Runner sells them on the internet:   http://www.blockaderunner.com/Catalog/catpg7.htm
Fall Creek Suttlery sells them on the internet:  http://www.fcsutler.com/