Online:

Travelers' Tales

Booksense.com

amazon.com

Borders

Barnes & Noble

...or to order a personally inscribed copy...

...or at San Francisco Bay Area Stores

San Francisco:

Clean Well-Lighted Place for Books
The Booksmith
Stacey's

East Bay:

2nd Edition - Montclair Booksellers
Pendragon
Diesel
Cody's
Easy Going
Orinda Books
Lafayette Books
Marin: Book Passage
Manfred's Printers Inc.