There is currently overlapping offers on these cars "$1 each for Black Friday" and "Buy 1 Get 1 half price" making it 2 for $1.50 (75c each).
Plus save an extra 5% if you have the red card.
The only draw back is what you get will be completely random.
The deal has changed - $6.74 for 4 cars now (overlapping deals of 4 for $9 and buy 1 get 1 half price)