If you want to do track days consistently, join the Mazda Car Club of Australia. It's cheap, CAMS affiliated, and you don't have to attend too many events to maintain membership. Being CAMS affiliated means you can attend any CAMS event held by clubs as long as you meet Sup-reg requirements (licence level etc etc).
If you just want to race Winton, get an AASA licence from them ($50 annually) and go there on fun days/test days.
If you have someone called "Alex", "Axspeed", "Lisa" come and ask you to pay them for a track day, give them the big middle finger, stab their tyres and call police. Don't trust them as far as you want to throw them...
3 MPS - Rolling on Pirelli PZero Neros, sitting on Bilstein B12's, stock internals... still makes me smile with the Zoom Zoom.