That's the problem with some of the books. I bought 'Paddy Finucane book' off the internet for a big money. I think it was something like 75 bucks and it came all the way from Canada. But even though it wasn't cheap, this was the cheapest price far and wide.
So, the point I am trying to make is, internet is, probably, your best friend and, unfortunately, if it's out of print, the price is, well, as it is.
Good luck.