http://www.foxtix.com.au appears to be the official ticket seller this season, as you are directed there from the grandprix.com.au website. For international visitors, I have in the past used easygpt.com, whom I found very good.
Bit of a weird question, but did anyone take a child with them last time and have a children’s grand stand ticket? I could pass as an under 12 (probably!) but I’m wondering if the tickets look different. The reason I ask is because in 2009 I bought a children’s ticket with the four corner GP Advantage package and when the tickets arrived, there was no difference between the adult tickets and the children’s tickets. I’m not looking at doing GP Advantage this time around, but I’d like to try a grand stand again. So if anyone knows if they look the same, I’ll just grab a children’s ticket! :P (Hey, I’m a kid!)