You have 3 options for obtaining a copy! (I must admit to not quite understanding the pricing model of our publisher).
- Hard Copy: You can buy a hard copy directly from NOW for $99 (http://www.nowpublishers.com/articles/foundations-and-trends-in-theoretical-computer-science/TCS-042/book-details) or from Amazon for $101 and free shipping (http://www.amazon.com/Algorithmic-Foundations-Differential-Privacy/dp/1601988184/ )
- "ebook" format (which I believe is just a downloadable pdf): If you don't have room on your book shelf, and are happy with a PDF, the book can be yours from NOW for only $240. This is a bargain -- coming in at 281 pages, this is less than 86 cents per digital "page". (http://www.nowpublishers.com/articles/foundations-and-trends-in-theoretical-computer-science/TCS-042/book-details)
- Free download: The PDF is also available for free on my web page: http://www.cis.upenn.edu/~aaroth/privacybook.html