Amazon.com for as little as US $1.49. I'm not saying that the low prices reflect the quality of her book or anything. Perhaps the fairly low resale prices made the book even more popular and accessible, resulting in more people buying and reading her novels.
After the Mark Zuckerberg post, a few people messaged me saying that celebrities just do whatever they want and don't work hard. Well, some of those celebrities are just really smart business-people. If you could do a respectable series of books and use your popularity to help sell those books, why shouldn't you? Feel free to give your opinion by leaving a comment.