Where can I purchase this book?

If you cannot find this book in any bookstore (Borders, Barnes & Noble, etc.), then go to www.amazon.com and search for it. What you'll find is that there are many used and new copies of it for sale through Amazon's resellers. The prices will range from $0.01 on up, and shipping costs will be added (usually around $4.00).

You can also go to books.google.com and search for the title. You'll find the first two in the search results are this particular title. The second of the two seems to be the whole book; the first is a snippet.