You'll pay more, but at least you get to hold the book in your hands and look it over.
Search Inventory first: the title is often sold out at these stores, so you may want to check inventory online before your visit. Here are links to do that (be sure to locate the newest edition):
Borders:
go to http://www.bordersstores.com/search/search.jsp and step 1: click Add a Store at the right to locate your local stores by zip code; then step 2, search inventory by title, at left.
Barnes & Noble:
go to http://www.bn.com and merely search for the book in their online store. Once on the book page, you can click link at right that says "Check Store Availability" to find stores near your zip code that have the book.
Later this year (May or June July 08 December 08, sorry about the lateness) you can buy directly from the publisher bundled with a free Basic Config training CD which shows how to configure Outlook for the MYN system (covers about 5% of book content). You can still buy the old edition with the old CD there, if you wish.
Also, bulk purchases of the book are available from the publisher; call 925-735-3920 for details.