A book from one of my bookshelves. The first image shows a listing for the Steadicam 2 device, with a retail price of $20,000. The book states the first volume was published 1977, perhaps this volume includes a listing for the first iteration of the Steadicam.
ISBN 0713710594 http://www.isbnsearch.org/isbn/0713710594
Steadicam: https://en.wikipedia.org/wiki/Steadicam
