Reinfeld;
Unfortunatly, it's either knock-offs at the buck store, or custom made dolls.
The only "official" collection per se were those "Dungeon Dolls" a few years back, but Mattel tried to shut down the operation saying they blatantly stole their molds and models to create a "porno-dified" version of their world-known plastic playtoy.
Hey, it's a fetish, not unlike so many others out there most folks will never know of!