Horrocks' Book on the History of the Greek Language (2nd ed)

Wow, did anyone else notice that the paperback has mysteriously gone absent? This query concerns Geoffrey Horrocks’ Greek: A History of the Language and its Speakers, second edition. I had pre-ordered the paperback for less than 30 USD, but now the paperback is no longer available, and only the hardcover is available at ~171USD.

Paperback (no longer available):
http://www.amazon.com/Greek-Geoffrey-Horrocks/dp/140513416X/ref=sr_1_6?ie=UTF8&s=books&qid=1265592837&sr=8-6

Hardcover:
http://www.amazon.com/Greek-History-Language-its-Speakers/dp/1405134151/ref=sr_1_1?ie=UTF8&s=books&qid=1265592837&sr=8-1

Is this normal practice? Is anyone else seeing red as much as I am? :imp:

Well, another mystery: the paperback is 360 pages and the hardcover is 528.