Crowbar, "Broken glass" — apparently the record label withdrew all its releases, claiming it didn't have publishing rights. So it's not allowed for sale on Discogs per the "unofficial release" rule, and I don't know that this record has been reissued on vinyl.
The other albums I'd put in this category are available, they're just pricey, like Bohren & der Club of Gore, "Gore motel". I keep tabs on Secret Chiefs 3 7" singles too, but they run pretty steep for one track per side...