This one is fantastic, IMHO. You can watch the film in its entirety for free online (which I did) and / or order a copy from the filmmaker, Jose Escamilla, at http://www.theufomovie.com/ (which I also did).

To watch it online, just do a google search. I think a couple of places pop up where you can give it a gander.

If you go to Jose's website, be sure to watch the trailers. He has another film called Luna which looks great!