You can use this file on your Kindle, Nook, iPad, or any device that reads .pdf files. There are currently no plans to release versions of the book specifically for each eReading platform. There are technical issues with screenplay formatting in the various eReader formats (see an example here), and until Final Draft adds an export to .epub feature, .pdf is the simplest way to go.
If you want the physical copy of the book (which is a large format designed for you to photocopy pages for cast and crew), Lulu also offers that. They also offer promotions periodically on shipping. I try to notify you in our Twitter feed when that happens.
Or, if you prefer, you can always order the book from Amazon.