Rancor and Keeper Metal Miniatures (For Star Wars: The Roleplaying Game) by West End Games
Like the Jabba’s Palace set of miniatures, the Rancor Pit Collector’s Set was put out by West End games for Star Wars: The Role Playing Game. The rancor itself is in 5 pieces (torso & head, two arms and two legs) and is quite heavy. Seriously, you could probably use this as a weapon of some sort. The sculpt isn’t bad, but it does look a little odd to me somehow. It’s more or less the correct scale relative to the keeper and the other models in the series. (Click for a larger view.)
Like the Jabba’s Palace set, this also comes with an insert describing the characters that has their game stats on the reverse. I would say that this set is a lot harder to find than the Jabba’s Palace one. While I wouldn’t really call either “rare” it is certainly harder to get the rancor set at a reasonable price.