If you don't want to do the leg work or hate dealing with car dealers (who doesn't) just use a broker service. Unless your really good at negotiations you won't do better than what they can broker for you.

Some sites
www.carbroker.com.au
www.visioncars.com.au

Now is a good time to buy as prices have come down about $2,000 on the Japanese made Jazz in prep for the cheaper sourced Thai Jazz coming in the next few months.