Thanks for writing us about this, and we're sorry for the confusion. This is a bug, and we'll fix it. The book is actually out of print, but there is a new edition at http://shop.oreilly.com/product/9780470565520.do.
Also, we do have quite a few free ebooks, and you can find them at http://oreilly.com/free/index.html.
Thanks again for letting us know!