As of July 1st, 2016, 360 Performance Circle has become
Kaizen Online, a part of Kaizen Institute

KI

Why is the entire "Enhancing and Sustaining Lean Improvements" series not for sale yet?

It is!  But, it's just not ready for shipment.  The entire series has been carefully scripted based on latest information and we are right in the middle of production of the remaining episodes.