If you scroll down past the book's description, you'll find a box towards the right of the screen:
If you buy a new print edition of this book (or purchased one in the past), you can buy the Kindle edition for FREE. Print edition purchase must be sold by Amazon.So, for those who like holding a real book when convenient, but love the option of carrying an entire library for the weight of a book, you can now get a free Kindle edition with the purchase of the print edition.
A quick note on my long absence: I've been dealing with some personal issues that have pretty much occupied me full time. I hope to get things under control by the end of November, so that I can resume my normal activities.