The first, N8285Q/NC-50, is listed for $1,400,000 in Washington state. The airframe has 2695 hours, and the seller points out that the "jet quiet" cabin is a third larger than a King Air 350 at 2/3 the price.
The second, N8244L/NC-29, is listed for $1,600,000 in Oklahoma City. It was a marketing plane for Beechcraft that was featured on many magazine covers stories and in many articles. It is the only Starship with the original factory N number. The airframe has a higher total time (3985 hours), but you won't care, because included in the sale is NC-43, a parts aircraft sans engines.
But wait - there's more!
The seller is also including "plenty of tires" and a third set of props. He/she also points out that Starfleetsupport.com has parts and support available to Starship owners.
If you love the Starship but can't quite swing the cash for one of these examples, be sure to explore Bob Scherer's site. There, you can find downloadable flight manuals, parts catalogs, wiring diagrams, and all kinds of historical information.
I also recommend picking up a copy of The Starship Diaries, by Dallas Kachan. It's a fictional account of a very successful Silicon Valley resident who purchases a Starship and then "slowly meanders around the planet with no fixed route, and no fixed return date."