Amazon are low on the book. A friend tried to get it from there but waited for months(!)*) and still did not get it. He then (just 1-2 weeks ago) ordered it from the link below & got it within what seemed to be less than a week:
http://www.thegolfingmachine.com/book.htm
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EDIT (to make it VERY clear):
*) By months I
literally mean m-o-n-t-h-s. Something like order in October last year and still nothing by May this year. Yes, actually!