Well, some on youtube. Other places, I’m still looking.
http://www.archive.org/details/moviesandfilms
Watch full-length feature films, classic shorts, world culture documentaries, World War II propaganda, movie trailers, and films created in just ten hours: These options are all featured in this diverse library! Many of these videos are available for free download.
Under subjects Science Fiction
Killers From Space
Giant Gila Monster, The
The Wasp Woman
Idaho Transfer
Planet Earth: Our Response
there are probably also plenty of old radio dramas like Dimension X.
http://www.archive.org/details/moviesandfilms
There are MANY more under Horror
Mad Monster, The
Teenage Zombies
Werewolf in a Girls’ Dormitory
Werewolf of Washington
Bloody Pit of Horror
Bride of the Gorilla
Lady Frankenstein
Nightmare Castle
The Sadist
The Screaming Skull
White Zombie
Night of the Living Dead
Frankenstein
Rogue’s Tavern
Carnival of Souls
Night of the Living Dead
The Terror
The Vampire Bat
Nosferatu
The World Gone Mad
Satanic Rites of Dracula, The
Blood Tide
Bloodlust
Das Kabinett des Doktor Caligari ( The Cabinet of Dr. Caligari )
Dr. Jekyll and Mr. Hyde -
Haxan
The Little Shop of Horrors
The She Beast
The Phantom of the Opera
Sweeney Todd: The Demon Barber of Fleet Street
Brain That Wouldn’t Die, The
Creature from the Haunted Sea
Dementia 13
Phantom Ship , The
Bluebeard
Fall of the House of Usher
City of the Dead/Horror Hotel
Prehistoric Women
Shock
The Last Man on Earth
Atom Age Vampire
Dead Men Walk
Deep Red (Profondo Rosso)
Horror of the Zombies
King of the Zombies
The Corpse Vanishes
The Witches’ Mountain
Horror Express
Horrors of Spider Island
The Veil (by episode)
Cathy’s Curse
Jesse James Meets Frankenstein’s Daughter
Scared to Death (Bela Lugosi’s only color film)
The Monster Maker
The Vampires’ Night Orgy
Werewolf Woman
The House On Haunted Hill
Bad Taste
Attack of the Giant Leeches
Les Vampires (1915) directed by Louis Feuillade
Devil Times Five
Many, but not all, of these are actual very good films.