A book that was on daughter's A Level suggested reading list was The Wasp Factory by Iain Bankes, she chose other books, but I was always on the look out for it in the charity shops and found it in time to take on holiday. It was very strange and not one that I am sure will be to everyone's taste, but certainly very different to anything else I have read. One I would recommend is The Alchemist by Paulo Coelho - I know it has been around for a while, but if you haven't read it - try to do so - it is a real feel good factor book. I have just finished Incendiary by Chris Cleave - I found this to be very upsetting and couldn't read it at bedtime as it gave me bad dreams.
Do you find that some charity shops charge a lot more for books than others, our Oxfam always seems very overpriced to me, whereas our Barnados and Mencap shops are much more reasonably priced.