Saturday's Bargain Book Buy

Really please with myself over this one. I've had The World According to Clarkson: Volume 3 on my wishlist over at BookCrossing for quite a while now. I liked the first volume and already have the 2nd on my TBR shelf. Then, whilst doing the family shop, I spotted the hardback for £2 (brand new) in Sainsbury's. That's only a tenth of the retail price (originally £20). I think this has to be one of the best book bargains I've got in a while.

What was your most recent book bargain? Can you beat mine?