Many of the very inexpensive Kindle ebooks are in the public domain (i.e. you can get them legally and for free on the internet). Some are individual short stories.
If you see multiple ebook versions of the same ebook at different prices, the work will again often be in the public domain. Sometimes the more expensive version will have "value added" (e.g. extensive notes), but often not.
Kindle books priced above $10 typically have a list price (set by the publisher) tied to the price of the hardback version. Amazon often provides a substantial discount on the list price though.
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