Yeah, it depends on the property really. Most of the Aliens and Predator figures can be found very cheap on eBay, but some other ones like Jaws really seemed to skyrocket over time. I keep meaning to go back and buy all the Gremlins figures, but I can never seem to find a good deal on them.
Apparently King Diamond was a limited run (initially) so I have no idea if I'm actually getting one or not. It was In Stock when I ordered, so I assume so, but who knows. Taking a long time for my order to ship...