Finding the right car under $500 down in Castle Rock, CO is just a few simple steps away. Each used vehicle in Castle Rock listed can be bought with $500 down. Buy a car with 500 dollars down in Castle Rock and get an auto loan with $500 down at a single convenient Castle Rock Colorado location. Our Denver area used car dealers offer you the best chance to finance a used car in Castle Rock with a low down payment and a monthly payment that fits within your budget.