Here are the ways you can buy it: the hardcover list price is $29.95 and the CD audio lists at $50. But that is barely the beginning. Amazon sells the printed book for $16.47, the Kindle e-book version for $14.82, the audio CD for $31.50, and the downloadable audio for $34.12. B&N.com has a "member" price for the hardcover of $15.52 and the CD for $36. At Borders.com, the book is $17.97. The Sony Reader e-book is $14.50.What Osnos takes away from this is that a) things are bananas in publishing, and b) readers should take advantage before they figure it out. I think it probably has more to do with the ease of comparing prices, as bookstores have always had the discretion of their own pricing (although fewer format options).
Just remember, in your shopping, that some people are not so fond of the Apple bookstore, even though vooks are big in iPad world.