You already own this but in case you want a Kindle version so you can search the text or whatever, The Lion, the Witch and the Wardrobe is now 3 bucks, which is slightly less than half the usual price. This is book one, no wait, book two, no wait, book one, of the Chronicles of Narnia series. Book One, in my opinion. Fight me if you want.
While we’re on the subject of books you already own in meatspace but not yet on Kindle, Bratchett’s Equal Rites: A Novel of Discworld is two bucks, way less than half price. Go for it!