It's been a good week for this generally - yesterday I got Office 2004 for Mac [1] for £2.50 at another shop, where I also found one of the Harry Dresden books and A Storm of Swords part 2 for 50p each - I was late coming to the series and I've only just finished A Game of Thrones so hopefully I'll pick up the first part of Storm... before I finish A Clash of Kings. And on Monday I got the latest Temperance Brennan novel in hardcover for £2.
[1] I already have Office 2004 but I've used up two of three keys; I'm hoping that one or more of the keys on the one I bought is unused, which will be handy if I need to reinstall.