Are Kindle books cheap?

Related questions

1. Is an ebook a PDF?
2. Do ebooks cost money?
3. What are ebook downloads?
4. What's the difference between an ebook and a PDF?
5. Can you read PDFs on Kindle Paperwhite?
6. Is Paperwhite too small?
7. Is reading books bad for your eyes?
8. Can Kindle read other ebook formats?
9. What is the smallest Kindle?
10. How do ebook readers work?

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14. #since
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16. #unless
17. #paperback
18. #which