This might sound like a dumb question, but have you checked Youtube much? Their catalog of "pay to stream" movies is (to me) surprisingly good. Definitely not just the recent blockbusters... they've got all sorts of older and less well know stuff. Just for shits and giggles I pulled up the Robert Duvall filmography just now and check and found even the oldest and lesser known ones on Youtube, most for around $3-4 to watch.

Strangely enough, since discovering this aspect of Youtube, that has become my goto site for most movies, and definitely helped cut down on my pirating activity.