Just picked up a 2nd hand e90 m3 a couple of weeks ago and was shopping around for new tyres. Did a price survey for Michelins Pilot Super Sport around Melbourne and this is what I found:
Front 245/35/19
Jaxquickfit $379
BobJane $399
TyrePlus $390
Rear 265/35/19
Jaxquickfit $473
BobJane $500
TyrePlus $475
Heard TyrePower are pretty competitive too but didn't call them up.
Michelins have a $100 cashback now so in total $1600 for a set of 4 at Jaxs.