Local poundland had a few copies of a double book - one side the original Twilight, the next 'Life and Death', Twilight reimagined in a gender swapping role. Released for 10th anniversary of the book (am I that old already?!).
Seems like a pretty good deal, £1 for two books in one hardback.
Retails on amazon for £7- £13 but much more expensive elsewhere.