The problem is that now that Mark bought the C6Z he's going to use it for himself so I won't be able to borrow it anymore.
Stock replacement rotors from the parts stores run about $52 each. Just a few years ago they were close to half that. Seasoned (lightly used) rotors perform better and last longer at the track than brand new ones so I'm going to start hording people's take-offs when they upgrade. Most people who just run on the street replace them way too early and leave plenty of life in them.