The Mercedes-Benz SLR McLaren was an expensive supercar that boasted a top speed in excess of 200 mph and could sprint from zero to 60 mph in under 4 seconds. Unless you were a CEO or media mogul, the SLR was unlikely to show up on your shopping list, as a new one cost around a half-million dollars. It's equally unlikely that you'll ever even see one, since overall sales numbers for the North American market were only in the hundreds before the car was discontinued in 2009.