I bought "John" by Cynthia Lennon for £5 in Borders. It was a hardback and was reduced as it had just gone out of print, according to the sales assistant. I guess they're pushing the paperback version instead. I've not started reading it yet.
On the same day I got The Beatles: The Complete Story of Four Lads Who Shook the World by Tim Hill for £7. Both were for research purposes, really. The Tim Hill one has some great pics and a useful chronology up to 2006, which I'll be using for the day-after-day section on my site.