Several of J.R.R. Tolkien's books are for sale for $1.99 on Amazon Kindle:
- The Nature of Middle Earth:
https://www.amazon.com/Nature-Middle.../dp/B09CT83X2L
- The Complete History of Middle-Earth Vol. 3: The Lays of Beleriand:
https://www.amazon.com/Lays-Belerian.../dp/B0931YXSYM
- The Complete History of Middle-Earth Vol. 11: The War of the Jewels -
https://www.amazon.com/War-Jewels-La.../dp/B0C4LDGPJQ