Any old movies like this one?

Yep, try this 'The Last Man On Earth', heres a link where it can legally be streamed or downloaded :)

http://emol.org/movies/lastmanonearth/index.html

Freaks (1932)
The Haunting (1963?)
The Creature from the Haunted Sea

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Freaks, The Haunting and Caligari were all well funded movies by famous directors. If you want ultra low budget with little known directors that manage to be worth watching then "Night Tide" is a good choice. Poetic with just the right amount of chill. Not many others like that in the US.

There were some quality low-budget British horror movies make in the 50s/60s.

Repulsion!
Check it out, the psychological horror in it is identical to Carnival.

"Horror Hotel" (1960)...with Christopher Lee. Very atmospheric...like Carnival of Souls. And just as creepy. Another one, though not as good as COS is "I Bury the Living" (1958).

Night Of The Living Dead.
Spider Baby
Carl Dreyer's Vampyr (one of the most atmospheric films I've ever seen)

Normal Is A Myth.
http://www.preventchildabuse.org/help/reach_out.shtml

One movie that never got the kudos it deserved due to poor DVD releases and even worse original prints was this old Edward G. Robinson movie called The Red House. Brilliant no-budget moviemaking! You're more than likely find it in the discount bins at the supermarket, but I got my copy in a 100-movie Mystery and Suspense pack I picked up from Amazon.
Another one you might want to check out is Orson Welles' adaptation of Kafka's The Trial. Luckily, that's gotten a proper remastered release, so it'll be easier to find. Lots of shadows and mysteries with no answers.
Hope you enjoy!

"But, hey, that's me, I could be wrong."