The Cannabible Collection?

I was browsing the marijuana books at Amazon, and was interested in picking up The Cannabible, by Jason King. I noticed that The Cannabible 1, 2, and 3 are all priced at $16.47 each, but The Cannabible Collection (http://www.amazon.com/Cannabible-Col...e=UTF8&s=books) which comes out in April appears to be all three volumes in a box set, is also priced at $16.47. Am I missing something here? ::scratches head::

Also, for anyone that has all 3 volumes, which is the best? Thanks :)