You could also try http://www.option1garage.com.au/NewTyres.htm KU36's are just out of your price range if you wanted something that's pretty good, maybe KU31? Or the Federal 595 SS if its still on special, they were very cheap 1-2 weeks ago.
EDIT: it was 40% or so off a week or two ago but the current prices on 595 SS are cheap 265/35/18 $201.00 .... just out of your price range. It cost about $80 to get the tyres via courier from Queensland to Melb (I think)
I got 255/40/17 in Federal 595RSR's, a high end (non R compound) motor sport tyre, excellent dry weather, not good for wet weather. And I got it for under $300 each including postage recently, check with Option1 if the special is still on, the special was all Federal tyres and 595SS was a lot cheaper than the RSR.