normal price is IDR 1.100.000/car with 12 seater.
and my experience i use two car.price per car IDR 450.000 ( i use two car for 12 persons )
why i choose 2 car not mini bus,because it allows me pass traffic jam in Bali, with a small car we could enter the small road and the tour could be faster.
price little bit same.
if not wrong i use ubud vacation tour, i forget website. i just know email : ubudvacation@gmail.com