Eastern creek and the ardc very rarely book out the skid circuit now to clubs, its more driver training, or you need to book through their driver trainers...
Oran park you can hire out the skid pan with no insurance, however it does book out quite quickly and most weekends would be booked out!
www.autosports.com.au have motorkhana days on the skid pan there a bit, however during the year www.initialdrift.com.au have many days on Oran Park North, South and some GP days I think? Some members from SAU NSW have done a few days with them at OP, really fun days out!
There is also another group called www.projectd.com.au
Hope that helps mate