How close are you to Hertfordshire. Theres a wonderful man on Hitchin Market on Fridays who sells new and popular paperbacks for one pound each. Best bargains for miles.
Plenty of charity shops on the high street in every town and city. I never pay full price for my books, and I am an avid reader. I never keep them after, I hate to read the same book twice, there are so many out there, I shall never get through every one I want to read, including Kathy Reichs. I just take them back to one of the charity shops. I'm sure if you look you will find some and they are in very good condition, they don't accept them otherwise.