If your library has it, Kanopy is free and includes a fairly large rotating set of Criterion films. Also some popular movies (Ex Machina was on there last time I checked) and a lot of documentaries. Some mostly-terrible single-camera TV learning type programs. But overall it's a damn good selection. Limited number of views per month but you can watch at least one movie a week on it—may vary library to library, not sure how the payment structure works. You won't find Marvel movies on there but if you're into cinema it's worth the time to sign up, especially if you don't pay for Criterion or any of the other, specialized streaming services along those lines.