If you want to slosh around in old Roger Corman produced stuff, then you have to see Galaxy of Terror
. Joanie Cunningham from "Happy Days" gets squished, and some other babe gets raped by a space slug in an infamous scene. Bonus: Ray Walston's in it.
A site I frequently visit that has reviews on sci-fi, fantasy, and horror films is Moria, at
How old is the Roger Corman stuff?
I find it hard to watch stuff pre-1980.