There is a fellow who is selling a copy of the book The Dancing Chain on ebay:
I think the line about these books selling for over $150 is somewhat exaggerated but who knows.
On a rather sad note, it is my understanding that one of the book's co-authors: Ron Shephard, is not in the greatest of health. It would be a true pity to lose him as he is a wealth of vintage bike history, especially when it concerns derailleurs. I personally hope that he pulls through and that the trio of Henry, Shephard and Berto are finally able to print a new updated and corrected edition.
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Steven Maasland
Moorestown, NJ