The e-book can currently be purchased at two locations:
https://www.amazon.com/dp/B06XB7RKSS/
https://www.smashwords.com/books/view/707952
The Smashwords version is currently available in e-book format for free as a part of a promotional “coupon”, which expires on June 29, 2017.
A physical paperback version is now available at Amazon: https://www.amazon.com/Intermediates-Cuckoo-Mankind-DW-Cook/dp/1520696582/
Other formats are coming soon