We are on e-bay, motors.co.uk, AA cars, RAC cars, exchange and mart, and we pay for google ad words which seems to drive a lot of traffic direct to our website, we also operate from a main road showroom and have been here since 1981 so a lot of passing and repeat business. The annoying thing is trying to monitor response because people are blinkered into saying Autotrader when you ask where they have seen the car advertised, even though the car has never been advertised on autotrader, they then say that they spend all night doing a google search so unsure which site they came from. But all the other sites are no brainers compared to autotrader, combined they give us same response for a fraction of the cost, and are far nicer people to deal with.