Some options for purchasing the book:
1. On paper (e.g. from Campus bookstore: new or
used; Amazon.com: new or used (very cheap!))
2. Electronically, either from
a. CourseSmart http://www.coursesmart.com/047146886X
b. Wiley E-book http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470453958.html
versions have nice reading applications, with good display options, and
the ability to search the text, and to insert highlights and notes in
your copy. It seems most suitable if you have a notebook computer.
CourseSmart is a little less expensive, and has the advantage that you
can choose either an online version or a downloaded version of the
book. However it has the disadvantage that you don't keep the book: it
expires after 180 days. Once you buy the book from Wiley, it's yours to
keep. Also, that lets you download the book
to two computers rather than just one.