Suddenly available cheap from Amazon*, Do Androids Dream of Electric Sheep?: The inspiration for the films Blade Runner and Blade Runner 2049 by Philip Dick.
While we are on the subject of cheap books, did you know that the popular, and pretty good, “Longmire” of TV started out as a series of books? The Highwayman: A Longmire Story (Walt Longmire Mysteries) by Craig Johnson is also cheap on Kindle, which is the 11th point five in the series (apparently it is complicated). The first is The Cold Dish: A Longmire Mystery. (Kindle edition of the first in the series here.)