The search option on Google Play is pretty limited, so I don't usually bother looking for freebies or price reductions unless I have a specific book in mind. But I came across this free (in the UK at least) book essentially by accident
Racial Science in Hitler's New Europe, 1938-1945. Hardly a light read but it might be of interest to someone. On Amazon it's £32.50.
https://play.google.com/store/books/...d=8WPLZYsMaGEC