We're big fans of the King of Horror here at PDFU.NET, while we don't believe any of his stuff is in actual public domain. There are some movies that fall under Fair Use or even may be Orphan Works. Of course, King would still own the copyright to the Original Story or Novel. Anyway, we found a few that qualify for the site and may do all of his works eventually just because there are so damn many of them. Join us, it will be fun.
Dollar Babie$ we've found so far: