Amazon just keeps on adding to its selection of movies and TV shows available to those who pay for a $79 Prime subscription: the company added more content from NBCUniversal last month, and now it has announced a multi-year agreement with premium cable channel EPIX. The deal will bring about 3,000 new movies (and some original music and comedy content) to the service primarily from EPIX's three owners — Paramount Pictures, Metro-Goldwyn-Mayer Pictures, and Lionsgate. Amazon highlights flicks such as The Avengers, Iron Man 2, Thor, The Hunger Games, Pananormal Activity 2, and Justin Bieber: Never Say Never, so that should give you an idea of what sort of content this deal is bringing in. Nevertheless, the retailer is boasting that the EPIX agreement now brings Prime Instant Video's offerings up to 25,000 titles (with each TV episode counting as a title) — apparently double what was available when the Kindle Fire launched last year.