Borders have a clearance sale on at the moment - many hard and paper backs are just a quid. We got Hugh Fearlessly eats it all, a history of West Ham, the double pack of Alan Bennett (Untold Stories and Writing Home - this is £40 at amazon!) and loads of paper backs - we got a lot of Alexander McCall Smith (No1 Ladies Detective Agency series) for £1 a piece.
Edit - PS. This was in York branch, presumably other branches have the same. The best ones were upstairs, not in the usual reduced section downstairs. Look under the tables too, the best ones, especially the hard backs are down there.
They also had some CD language packs, but not mainstream languages - I think they were Breton, Latvian, Slovak, and so on.