The quick guide to car prices at that time:
$10,000+ cars were pretty nice and out of the ordinary except in Hole in One or Golden Road. Usually convertibles, full-size sedans or nicely-outfitted trucks.
$8,000-$9,000: Nicer than ordinary but not really luxury cars, either. Jeeps, cheaper "sports" (not really) cars and mid-size sedans, usually.
$7,000: The typical car price range in 1982. Everyday compact cars in the decent range with some options.
$6,000: The cheaper small cars; subcompacts like the Chevette.
By this point, I´m not sure that they played games for cars under $6,000. I haven´t seen one. It was a given by this time that the first number in Dice Game would be 6, at least until the Deluxe version entered the scene.
Interestingly, showcases at this time could go much lower, with $5,000 showcases not being uncommon; occasionally they even dipped into the $4,000s.