Ralph, I got interested in your book, so I looked it up in Australia with the idea it could be worth looking at, then if it is, purchasing it.
The local specialist photographic shop, "The Printed Image" in Melbourne were extremely helpful.
However once they had the ISBN, they immediately informed me they cannot get any copies of that book as the distributor/printer/publisher (take your pick) appears to be in receivership.
They remarked, if I could get any copies, they would gladly take them off my hands to sell.
I was given the impression that this has been happening for quite some time.