Three Options for Purchasing the Outlook Book
For the very best price, buy directly from Michael Linenberger's web store.
(if you have a team or department, bulk purchases of the book are also available; call 925-735-3920 for details).
Amazon
Amazon.com has the next best price. Use this link to buy it there.

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; just search on the book title (be sure to locate the newest edition) and then use the zip code lookups on the book page to find local availability.
Borders: borders.com
Barnes & Noble: bn.com