I'm in Central Tx and have found a few out here, but that is really a nice looking project for the money. A friend of mine found a 70 440 6pak, 4 spd, super trac pac Superbee, red with a black vinyl and interior, disc brake, ralley hood for a little less than that this spring just outside of town. Another friend of mine owned it back in 80, but couldn't afford to buy it back now after it was found. Amazingly it had no rust issues, just a missing motor and trans, but the Dana was still under the rear.
I happen to know where a 73 Challenger Rallye, 71 RT and 71 Coupe are sitting right now, but I'm trying to work a deal on them myself.
Good luck to your friend Wiildcat, where are you and your friend located? I'm in Austin.