Hope I'm not too late or anything, but try cruising google. You're bound to find somthing. What company are you travelling with?
I recommend All Seasons (http://www.camper.com.au
). I've done a couple of trips with them, been awesome each time.
Last time I was in Melbourne I wound up on a Top4 tourist site. Grab brochures, they can work like a bible from time to time ^^