I guess I have to admit that I'm not a knick knack kind of person, so I've never really looked for them, or remember seeing any anywhere either. But I did find a pin at the cat show that Sara (Edwina's Secretary) and I went to. It's just the head of a black cat with yellow eyes. I couldn't resist and now have it on a yellow blazer I have, which really shows off the yellow eyes.

Sorry I can't offer any help on where to find any, but I'll keep my eyes open from now on and let you know if I see anything.