it's listed on Amazon now, and the page will be built throughout the week.
Amazon.com: It Must Be... (a Grand Canyon trip): Drawings and Thoughts from a winter trip from Lee's Ferry to Diamond Creek (December 19, 2010 - January 2, 2011) (Volume 1) (9780615444055): Scott P Barnes: Books
It is a copy of the sketchbook (with a couple of pages added, intro, aknowledgements, etc) that was sent to the tour
ARTandWATER's submission for The Sketchbook Project: 2011 » Art House Co-op | We build art projects and communities
It's not something that will sell in the thousands, but there were enough requests for copies that I decided to get the publishing set up.
AND, here is a link to a blog post that has a coupon code to save $2 off the introductory price. (so $2 off the $9.99 intro price makes it $7.99)
Total Whitewater Fun: Grand Canyon sketchbook direct link
Note: the coupon code works only through the link int he blog, not through Amazon.