The Internet Archive
http://www.archive.org/index.php
They have loads of free to download movies and ephemeral videos from the 1950s and earlier. The legendary "Reefer Madness" is there, and a bazillion videos telling women they belong in the kitchen and should drop their jobs as soon as they get married. And then there's the four, five, seven or twelve (depending on what you watch) food groups, and most of them include butter.
My favourite short is a video about nuclear fallout where they try and argue away the dangers of it to make people feel safer... they mention that if your hair falls out due to explosure.. it is OK, you can just wear a toupee. Mutated kids?? No problem... there are far worse things to have than radiation enhanced children.
Favourite movie is "Attack from Space" featuring the corniest superhero you will ever see, and the most LOL fight scenes I have ever seen.
