9) 1950 GM Futurliner Parade of Progress Bus – $4,400,000

General Motors’ “Parade of Progress” Futurliner buses powered the company’s road shows between 1940 and 1958. Only twelve models of this automobile were produced in the Harley Earle era. The 1950 model (No 11), which has been restored to the original Parade of Progress configuration, sold for $4,400,000 at a Barrett-Jackson auction. SEE ALSO: Top 10 most expensive Rolls-Royce cars – #1 is a must see (With Pictures)