Cheap: Galapagos* by Kurt Vonnegut. If you have not read this novel, just read this novel. Don’t deprive your Big Brain.
Cheap: Marvel Myths and Legends*: The epic origins of Thor, the Eternals, Black Panther, and the Marvel Universe, Kindle edition, by James Hill might be necessary background reading if you care about the origins of Thor, The Eternals, Black Panther, etc. If you use primarily a Paperwhite Kindle, I would not recommend this book. If on the other hand you typically read ebooks on your computer using an open-source ebook reader or the like, or a Kindle Fire*, then you may enjoy the graphics.