Here we have a pretty awesome rubber Chucky head, which MGM sent out to video stores in 1988, for the promotion of the VHS release of Child's Play. Essentially a Chucky Madball, the head was made of a very high quality rubber and measured 3" high.
I've only ever seen one of these selling on eBay, so it's pretty damn rare in the world of cool promotional shit. I'm thinking only individual pieces were sent out to video shops, for display on their counter tops, which would account for why there are so few still out there, these days. Just a hunch though!