umm, where in aus are you? it's a pretty big place! ehhe
if yer in melb, for body kits, you can't go past Z Shop / Z Spares in Glen Iris.. they've got a website at www.zspares.com.au.. they aren't the best price wise for anything really, but they've got a heap of awesome Zed stuff there, including aftermarket bodykits.
Managed to find a second hand front left overhanger for my bumper after someone decided reversing into my car at 60 would be fun!
I looked into body kits for my 79 280zx with the thought that I could remove my damaged valence and replace it with the body kit. The price quoted (sorry, no details on brand name or anything) was around $650, which I believe included a fin as well as front valence.
In my case, the bodykit fitted on top of the stock valence, so wasn't really any good to me.
thanks for the reply. i'm in newcastle n.s.w. i have to replace the stone guard under the front bumper.so i thought a spoiler would be easier.a 2nd hand stone guard is around $150 the price of a spoiler is not going to be much more.
and while i'm at it i may as well put a full kit on