Bought _The Silmarillion_ the last time it was on sale against reading it again, since I very much enjoyed the many times I read it when I was younger.
Tolkien's _Letters from Father Christmas_ is also on sale:
https://www.amazon.com/Letters-Fathe.../dp/B007978M9S
as is Ursula K. LeGuin's _A Wizard of Earthsea_:
https://www.amazon.com/Wizard-Earths.../dp/B008T9L6AM