It was published with Portfolio, an imprint at Penguin Random House. It can be purchased at any book store. Here's a link to Amazon: https://amzn.to/36nBlvJ
The full timeline of the book's progress is here: https://busterbenson.com/book/timeline
The book's primary market is anyone who feels like they are stuck having unproductive disagreements in any part of their life.
It walks through "8 things to try":
There are bonus materials available if you buy the book and email the receipt to "[email protected]" including downloadable reference guides for developing honest bias and guidelines for productive disagreement, a couple cognitive bias cheat sheet desktop wallpapers, and a code to get a few free months on 750words.com.