Ask HN: How would you get users for this? Challenge for you

Getting B2C users has always been a challenge. Even more challenging when trying to get get users for this problem... Car Buying! It is a big point in peoples' lives but isn't very repetitive in a single person's life. Rather everyone has to look for a car but might use a solution to look for one every couple of years.

Ya'll are a smart bunch, how would you find these users?