I just bought it from Amazon Canada.
While the quality of writing and discourse is of a higher level than other internet forums I have participated in, the political writers on Medium are pretty closed minded. After two years, I might have found 20 lukewarm fans of my TDG: "Great idea, Dave, call us when it is built". Which kind of misses the point: if the people don't build it, it won't be built.
After 165 articles and 4200 comments, my postings on Medium do not go very far.
My TDG book is available for a free read. It'll take about three hours to read it:
http://www.tiereddemocraticgovernance.org/tdg.php
As well, I have put my my first TDG novel of an average American building this system:
http://www.tiereddemocraticgovernance.org/dfp-chapter.php
Again free read. Two more novels to come this year.
For something a little quicker to read, here is my review of a political innovator I found about 15 years ago.
http://www.tiereddemocraticgovernance.org/blog_details.php?blog_cat_id=20&id=34
But so few of us!