Try Hancock's Fabric, Joann has some too, haven't found any at Walmart. It's not the easiest to find, but it's out there.
I know you can get a lot of it online. There was a pattern that I liked very much, I think it was called "A Hoot". Check it out, it's adorable!
http://www.quiltingboard.com/t-84151-1.htm
Look at this one, it's just a cute!
http://www.quiltingboard.com/t-113477-1.htm