I think any stencils could be used on furniture just use fabric paint
HobbyLobby and Micheal's if you want to look at them in person before purchasing.
Craft and hobby shops, some fabric stores, Wal-Mart, target, art stores, on line, Amazon.
Amazon, Michaels, Hobby Lobby, Walmart have good ones.
Any craft store will carry a diverse selection of stencils that can be used for your furniture project. I always lightly sand, paint/stain, let dry, stencil, then apply a wipe on polyurethane for protection. I do use acrylics and have not had any issues. Best of luck.
I love Stencil Revolution :)