So I'm thinking about buying a Stoptech ST-40 BBK that uses 328x28 rotors. Everything fits on my car, except the rotors are done. Is there a cheaper alternative to buying $400 rotors on racingbrake, like buying 1-pieces instead, or is there no option? I'm new to BBK's, and someone's selling the stoptech BBK for $600 plus stock, so i'm not sure if it's a good deal or not. Thanks in advance