There's an excellent record store in the West End of Glasgow called Fopp, now part of a national chain of the same name. Apart from selling a lot of records, they've got in the habit of selling remaindered and new books at cut-down prices, with the distinction that the books they sell are frequently the kind of quality stuff you really want to buy, but at ridiculously cheap prices. Average paperback prices are £5, or even just £3.
The reason for carrying out this piece of free advertising is that someone in the company has bought up an enormous quantity of remaindered copies of the SF Masterworks and Fantasy Masterworks books released by Gollancz. Fopp are selling them all - I think it's all of them - for £3 each. Very worth your time, I think.
And no, they're not paying me to do this.