As an eBook, it is only available on the iBooks app and is only viewable on Apple iPads, iPhones, and iPods. (Sorry, no Kindle editions yet! I was disappointed, too!) You will need iOS 7.0 or later to download the app.
There is, however, a PDF version that you can purchase and download as well, AND you can open it in Kindle!
Print copy $11.99
eBook copy $9.99
PDF copy $9.98
--> My Bookstore