My little brother used to play with these (many years ago as he is 24 years old now.) I have not seen them since late 80's, early 90's. I think they went the way most of my childhood toys did. In hindsight, I wonder how these ever made it on the market as they were probably a pretty bad choking hazard.
Have you tried contacting the maker of them to see if they have plans on relaunching them (Mattel, Hasbro, etc)? Good luck in your quest!