I used www.BidMyCar.com.au to find the best price for my new Mazda. McGrath's were not actually the cheapest but they were only $200 more than the cheapest but are much closer to me than the other dealers. So I chose them, so happy I did. I was treated really well and the salesman did everything he said he would (much better than my last car buying experience) Very, very happy with McGrath Mazda.
Approximate cost: $16500