Rich is on Facebook. Last was living in Pennsylvania. Might be back in NYC, I heard. I enjoyed his book. He plans to do more volumes eventually to complete the tale.
All that remains to be published of the Seth Material is the 2nd ESP class sessions (written about in Conversations With Seth). That likely will require several volumes. They show a different side to Seth. At times, he is almost poetic.
There is little money to be made and someone has to do all the work. It is complex, personally. This stuff doesn’t just materialize.