The SAGE Circle - https://www.thesagecommunity.com/the-sage-circle
The SAGE Method - https://thesagemethod.com

Cracking Open: Adventures of a Reluctant Medium -

Follow these links to purchase the book by country (if your country isn't listed, go to your Amazon page and search for "Cracking Open: Adventures of a Reluctant Medium"):
Cracking Open US
Cracking Open Australia
Cracking Open UK
Cracking Open Canada