I picked up a bag of practice golf balls the other day (they look like minature wiffle balls if you can picture that) and one of my cats just love them. Ninja packs them around and chases them around the house. He even takes them to the bathtub, drops them in and chases them around the tub for while! :D It was a cheap toy for your cat if he or she like balls. Anyone else have a good toy that I can try on my kitties?