A:AnswerDepends on the book. They're anywhere from .99 to 15.99. But you can get kindle unlimited for 9.99 a month and have a large list of free books to read if you read fast and often. There is also the kindle lender library
A:AnswerYou can choose to buy the one with no ads but, the ads only show when the Kindle is in the off position. Ads don't pop up while you're reading. As far as I'm concerned, they can show whatever they want when I'm not using the Kindle.
A:AnswerAlthough the number of books would naturally depend on the size of the books, I routinely keep about 100 books active. Last year, when I went on a cruise where I wouldn't have access to the internet, I downloaded 150 books without any problem
A:AnswerYes You can. The Kindle software is the same across all platforms so if you use Kindle on your Ipad and download a free book, it automatically downloads on your Kindle 6".