It can be a pain looking for out of print books, even on the internet.
I just bought a uncirculated mint second hand copy of Jack Broughton's book "Going Downtown" which goes over some of he ops he went on and his eventual court martial. It was a 1st edition and cost me less than buying it new!
I bought my copy through ABEBOOKS -
http://www.abebooks.com/
they have a lot of books of all types both fiction and non-fiction and is certainly worth a look.