For a gallery of this car from last years SEMA http://justacarguy.blogspot.com/2010/12/carroll-shelby-prototype-cobra-1.html
the other I know of two others, as CSX 2305 was a one owner, but just sold last month http://justacarguy.blogspot.com/2011/10/one-owner-1964-shelby-ac-cobra-289.html