Looks like this book could be coming back into print next year. It's currently available for pre-order on Amazon.com for $64.90 ...

http://www.amazon.com/Dave-Stevens-Rocketeer-Artists-HC/dp/1600108334/ref=nosim/marvelmasterw-20

Dave Stevens' The Rocketeer Artist's Edition HC

Hardcover
Publisher: IDW Publishing (May 25, 2011)
Language: English
ISBN-10: 1600108334
ISBN-13: 978-1600108334