While I'm a "book in my hands" kinda gamer, I certainly also like having digital versions around so I can check things in the rulebook whenever I need. So, while I've got the physical versions of both the Official Movie Sourcebook and Haunting of Equestria for the Tails of Equestria RPG, I'll probably pick up the digital versions, too, which are available now.
From the announcement:
The Official Movie Sourcebook allows you to take your adventure far beyond Equestria’s borders with everything you need to bring new and exciting characters, locations, and stories to your Tails of Equestria game.
The Haunting of Equestria is the fourth adventure book in the Tails of Equestria line. It features familiar characters in a completely new scenario. This is the most epic Tails of Equestria adventure yet, perfect for characters level 5-10.