Yep I'm from Perth. There's a few other guys here with brushless truggies that I know (not all of them post much) mxracer, SV6000, Nissanmania, maxd out, plus at least 7 other guys that I have raced brushless truggies with. Usually 5-7 on a race day.
Unfortunately July is our winter so there isn't as much racing happening and the most regularly raced at truggy track closes for a couple of months in winter.
Here's the sites for a few of the tracks:
West Coast Model Rally Club Our usual track. It's on Friday nights and is meant to be 1/10th electric only, but we've managed to get them to let us (only just) keep racing truggies after gradually moving up from E-maxxes.
Carine Remote Model Car Club Doesn't have many members any more and therefore not much regular racing, but still a fun track and isn't affected by the rain as much as some tracks, so more chance of racing in winter. Nissanmania would be the one to talk to about have a race day here, because it's run by him and a couple of other volunteers.
Radio Rally Club They have a temporary track setup on grass. It's a 1/8th nitro club, but a least 4 of us are going to race our brushless truggies there tomorrow for the first time, so we'll see how it goes.
Model Off-Road Buggy Club Mostly a 1/8th nitro track. I've been to a few practice days on the old track lay out, and have been meaning to go there again. I know a guy with a brushless ST-RR who is a member there this year. I should get around to finding out how it's going for him.