According to ClassicCars, a fully-restored black 1967 Chevrolet Impala is now worth anywhere between $20,000 toR$50,000.

Butters episode is most likely one of the most expensive, but there are multiple props and special effects in this episode. Her green eyes and red-smoky background at one point must have been more costly than other demonic, smoky scenes because production should have had to implement different details.