Here are two I got for a song whilst on holiday last week from a bookshop in The Lake District of all places.
The first one I wasn't sure if I already had but thankfully I didn't.
U-Boat War Patrol-The Hidden Photographic Diary of U-564 by Lawrence Paterson
http://www.amazon.co.uk/U-boat-War-P...3869551&sr=8-2
The Golden Horseshoe-The Story Of Otto Kretschmer by Terence Robertson
http://www.amazon.co.uk/gp/offer-lis...&condition=all
Pay little attention to the price, I paid £4.99 for a brand new copy.