Alan Boyle reports at MSNBC.com that “several” vendors are in negotiations for $500 million in commercial orbital transport service (with the same acronym as commercial off the shelf):

Oklahoma-based Rocketplane Kistler and California-based Space Exploration Technologies, or SpaceX, acknowledged that they were finalists. Other sources, speaking on condition of anonymity because of the official NASA reticence, indicated that the Virginia-based t/Space consortium, California-based SpaceDev, Texas-based Spacehab and Andrews Space in Seattle were also on the list.

Before being bought by George French, owner of Rocketplane (whose flights I am offering as a prize at Space-Shot.com), Kistler had an agreement with NASA which was unawarded after an objection from SpaceX. In this competition, there are many strong companies and the winner may have a march on orbital adventure travel competition. I hope the winner chooses a fixed price agreement so it will maintain the discipline to compete in the private markets too.