Walmart sells craft feathers:
---http://www.walmart.com/ip/Kids-Craft-Feathers-Assorted-Colors/19525347
(eliminate the three dashes in front of the link when using the link above)
Micheals and Hobby Lobby has feathers also. You can use the pheasant tail feathers that are sold in the flower arrangement section and whatever feathers they may have elsewhere in the store.
The walmart feathers are small but they are tougher than chicken feathers. They are either goose or duck.