This is maybe becoming more of a general horror discussion thread, which is likely a good thing.
Anyway, I just found another small line specializing in reprinting old horror.
Resurrected Horrors. (Not to be confused with
Macabre Ink Resurrected Horrors.)
The books in Resurrected Horrors are regularly $5. But ereaderiq shows they do go on sale.
I saw a video where the guy mentioned how much he enjoyed
Disturb Not the Dream by Paula Trachtman (First Amazon review: 1 star - A parade of sexual debauchery and madness). That's how I discovered the line.