Hi Moondog,
Funny I was just talking to someone else about this book on the weekend while out bushwalking, I bought a copy last year, still haven't finished reading it...
However he also was having trouble locating it at a reasonable price so I looked it up on Monday when I got home and it's still available on USA Amazon (where i got it) - USD$26, ended up costing me about AUD$35 with postage, not bad for a hardback book I reckon - much more expensive via the UK Amazon according to my friend, here's the link:
http://www.amazon.com/Invisible-Everest-Innovation-Gear-Makers/dp/0970414358/ref=cm_sw_em_r_dp_n-lStb0VZ0QVABBW_tt