That one rotor is trash... might as well junk it.
But, it does seem like a pretty good deal... A set of rotors (front or back, not both... the one is trashed after-all) and EBC reds all around will run in the $200-$250 range alone. I'm betting the wheels would run at least $190ea... so on a low side to buy it all new would be $960 + S&H; and you're askin $800. Nope, not too bad.