However, finding them can be tricky. Amazon loves to push the "Rent or Buy" HD titles front and center.

Open Prime Video. Search for The Big Sick . Thank me tomorrow. Did I miss your favorite free movie on Prime? Let me know in the comments below!

When you sign up for Amazon Prime, you’re usually thinking about free two-day shipping. But buried inside the Prime Video app is a goldmine of cinema that doesn’t cost a cent beyond your subscription.