i dunno, but i dont have much trouble finding good ones at all.
my current ones are michelin pilot sports, which are worth waaaaaaaaay more than the 70 a pop they are charging for near new second handers.
try taleb tyres in tempe, agr tyres in sefton (where i got mine), top ten tyres in carramar, or theres some place in granville i think called seven day tyres, they always advertise in the trading post