When i got my bike in January, the owner before me rode the rear brake.. and in turn the rear rotor has some pretty gnarly grooves in it. i bought it without a roadworthy because he had another buyer, and i couldn't let it go with the price i was buying it for, my dad looked over the bike and i rode it and everything was in order, besides the rotor and rear tyre. got new tyres a couple of months ago. Now when it got a roadworthy, i got told that i would need to replace the rotor as soon as possible.. but i didn't have the money, now i do. i'm having trouble finding one, i found heaps in america, but the prices fluctuate, from $90-200+ and i honestly have no idea what one i need. i rang my local suzuki, and he quoted me $300 fitted.. can anyone suggest a good parts supplier, and is $300 a good price or not? cheers. bikes a 2009 suzuki gs500.