Millersville offers a free movie-streaming service to all faculty, staff, and students. It has many great films, including much of the Criterion Collection (some of the best/most important films of all time in their best formats, with special features).
Check out Kanopy. You log in with your MU email login and password and you get free films! You can also trim films into clips for class presentations (there are a number of documentaries that would be useful). These can be integrated into D2L forum posts, for example. Make your presentations stand out with video.