You might find something at the Internet Archive Movie Section (http://www.archive.org/movies/movies.php). They've got a number of older works there that you can stream for free. With some software, you should be able to capture any you like and store it locally.
The Prelinger Archives at the Internet Archive is an amazing resource. The original archive contained more than 48,000 examples of ephemeral films (advertising, educational, industrial and amateur) films. Many of these can be downloaded from the Internet Archive including such classics as Duck and Cover and Perversion for Profit (Part I) (not "...Fun and Profit", you'll note) and Are You Popular?
hidownload (www.hidownload.com) is supposedly able to capture streaming media but I find it a little tricky to use and sites like ifilm.com prevent it from working somehow.
I can't vouch for this site as it was down when I tried to check it out, but it might be worth trying the Scottish Screen Archive, which I remember being in the headlines a while ago. I'm sure there were to be clips dating back to the (very) late 1800s.
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