$1.00

The Anti-Crime Roadster.

From wikipedia:

"At the beginning of the decade, Barris, who loved extravagant design whether his or someone else's, had purchased the Lincoln Futura, a concept car of 1955 which had been built by Ghia of Italy. The car was sold to George Barris for $1.00 and it remained in his collection for several years, until he was asked by ABC Television to create a signature vehicle for their new Batman television series. ABC and Executive Producer William Dozier had earlier approached car customizer Dean Jeffries to build the Batmobile (which he had planned to do using a 1959 Cadillac), but the time needed to make the necessary alterations proved too great an obstacle. Desperate, they turned to Barris (despite the fact that Barris was known to be expensive and would not sell the car but, instead, only "lease" it on a weekly basis to the production). Remembering the Futura, which had been designed by the original Lincoln stylists to resemble a shark -- with a menacing, aggressive front and high tailfins -- Barris decided it was a perfect base on which to create the Batmobile. In three weeks the car was ready and the show was immediately a hit, the car becoming one of the most recognizable icons of the 1960s and possibly Barris' most famous work."