Remember back in the day when Amazon was just a really big online bookstore? It's grown considerably since and currently has a selection of digital movie purchases and rentals second only to iTunes.

Beyond that, Amazon also has a pretty large selection of movies and TV shows that can be watched at any time and at any pace with an Amazon Instant subscription.What's it cost? A subscription to Amazon Prime, required for access to Amazon Prime Video on PS4, will run you $119/£79 per year.

However, even without the Amazon Prime membership, you can still rent or buy digital copies of your favorite shows and movies, which varies in price.Chances are you've paid for content before.

Whether it's a DVD, a VHS or a digital copy, somewhere down the line you've picked up your favorite films for keeps.

What Plex does is let you take the digital copies of those films stored on your computer and stream them to almost any device under the sun via the Plex Media Server.Plex only recently hit the PlayStation Store, but has made a splash with its digital media-loving audience.

As one of the best apps on PlayStation 3, Plex is no stranger to Sony systems.

It was a key reason that media enthusiasts chose Sony last generation and may again this time around.What's it cost? In order to use Plex on a PS4 you need to be a Plex Pass subscriber as well as own a mid-level computer that you can use as the media center.

Plex Pass will run you $4.99 (£3, about AU$6) per month or, alternatively, $3.33 (£2, about AU$5) per month if you sign up for a year.