Is Plex free with Amazon?

I'm curious to know if Plex is a free service when it comes to using it with Amazon. Could you please clarify if there are any costs associated with integrating Plex with Amazon, or if the two platforms can be seamlessly linked together without any additional charges? I've heard some rumors that Plex might offer a free tier for Amazon users, but I wanted to get a definitive answer before proceeding. Could you help shed some light on this matter?