Where can I find floor stencils?

You can purchase them right on Amazon. They have a huge selection! Here is the link: Amazon Floor Tile stencils.

Michael s has them

Hobby Lobby has them too! I believe you can also find them at WalMart.

You can buy stencils at most arts, crafts or fabric stores. Also on-line. Use the Search bar and type in "stencils".

Royal Design and Cutting Edge Stencils have a ton of gorgeous designs.

Amazon is a good place to purchase any kinds of stencils. Or locally paint stores have them. I have also seen them on the craft stores. Check out Joan fabric as well.