I managed to purchase a copy of A Fine and Private Place a few years ago. Waterstones had to order it, though, and I waited about a week before it arrived.
You can probably get a copy in paperback from Amazon.
Just checked. Here's the link, but can only find used copies:
http://www.amazon.co.uk/Fine-Private...1419433&sr=1-1
This may mean it's no longer in print.