Amazon and Google Play have the eBook edition of Isaac Asimov’s The Galactic Empire Trilogy for $2.99 each
The Stars, Like Dust (Galactic Empire series Book 1)
https://www.amazon.com/Stars-Like…B003K15O
https://play.google.com/store/boo…C&hl=en_U
The Currents of Space (Galactic Empire series Book 2)
https://www.amazon.com/dp/B00FO6HUWQ
https://play.google.com/store/boo…kZ9L6Xu80
Pebble in the Sky (Galactic Empire series Book 3)
https://www.amazon.com/Pebble-Sky…B00FO70Y0
https://play.google.com/store/boo…AWRJCCy0I