I never actually knew these existed, but now that I do, I want them! Unfortunately, anybody who wishes to own these metal DOOM miniatures will need to shell out a good few bucks. Most of them are currently on eBay for no less than a hundred bucks!
These miniatures were made by Reaper, way back in the distant past of 1996. Available in never-opened blister packs, you can get your hands on Zombie Marines, Pain Elementals and Cacodemons. You can also get an unopened Mancubus for ten dollars if you're feeling cheap.
This post has reminded me how expensive these things are. And here I was considering getting back into Games Workshop stuff.