The rear rotor on my new '89 is heavily grooved and my front rotor is warped, so I'm looking to replace them. Shoot me a PM if you want to sell your rotors.
If I find my spare (I have more than 1 front rotor so dont panic who ever bought a rotor from me recently) I can sell you a front for $25. My rear ones are not much better than your description of "grooved" so I guess I only have a front - If I find it.
Cool.
Buddha.