Over on the website for the Collected Comics Library podcast, they had a list of what books were expected to be available at SDCC, and the Rocketeer book was listed as "Dave Stevens’ The Rocketeer: Artist’s Edition $100, Limited to 300 at the show," which I take to mean that they would be selling 300 copies at the show, not that the print run is limited to 300. (What the actual print run is, I haven't heard.)