I just picked up the Asimov Foundation series of 7 novels for $26, been watching these for a while, and that’s a good deal. They also have several other series deals, including the 5-series of the Hitchhiker's Guide to the Galaxy.
Various Ruth Rendell, Ian Rankin, Ellis Peters. Nothing tremendously exciting, but you might find something you like.
https://www.amazon.com/s/ref=s9_acsd...d_i=1000705681