Yes. One and the same.
They are having a little fun with a strange $150 listing on Amazon.
Amazingly, not long after GBS came out, the Amazon site stated that they had had the book, but weren't sure when they'd get it back in stock.
The truth is - I never sold it to Amazon.
The quarterly newsletters come with the purchase of a new book.
Can't imagine how that $150 listing could work.