Amazon and Google Play have the eBook edition of God Emperor of Dune (Dune Book 4) by Frank Herbert for $1.99
Books 1-3 and 6 in the Dune series have all been offered for $1.99 within the past year so hopefully they will reappear at that price point.
https://www.amazon.com/dp/B001F0WXX6
https://play.google.com/store/boo…gvJWFmjOo
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