I did one of these ages ago in Macromedia flash, and output it to quicktime. I added a lot of "hairs and scratches".
Have you tried the stock video websites?
Also, there may be places that sell old 16mm educational films, etc. You might find something cheap and have it scanned.
When i was a kid, we collected 16mm movie trailers (they were delivered to TV studios on 16mm). We had a whole reel of countdowns we'd cut off when we spliced the trailers together onto genre-sorted reels.... have NO idea where THAT ended up!
But some sort of film collector may have those kinds of things.
I picked an "SMPTE Universal Leader" somewhere on the VASST site. I think. I got it there, didn't I? It's a Vegas project file. I downloaded it to my VASST directory, so that should be where I got it. Helpful, ain't I?