Amazon has new service: amazonUnbox. It allows you to download DVD quality movies from their site and watch it on your computer or PC.
It is a great way to get quality films very cheap. Just download the movie you would like and you can watch it until it expires. Don't forget to check system requirements.
There are not many films related to photography, but here is one that they have and I have watched: The Photographers (1996) by National Geographic
The video is about NG photographers, the sacrifices they do to achieve remarkable photos. They share some tips, too
Being just $1.99 at Amazon, I strongly recommend to watch it.