just go to a Craft store. (Michaels, Hobby Lobby, Walmart craft section) you can get it is bulk, like i get a thing called 'a pound of love' its a pound of yarn and you can make like 3 er so hats and a couple headbands. its not to bad either.. only like 3 or 4 dollars.
CUSTOM hats and headbands for sale. Earflaps, strings, visors, lil pom pom thingers, borders. PM me.