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