I would contact hoyt and see if the limbs are available. Even if they are, I think you will need to use a dealer to get them. I have seen limbs on ebay, they seem to run around 80 dollars so I would factor that into the cost of the bow. The z3 cam are module specific.
Depending on condition, and level of accessories this sounds like a fair to good price. Not screaming deal, but potential to be a very good value. Not a rip off price IMO. The big question is does he want to mess with the limbs and associated additional cost. If it were me, I would not. Shop for a bow that more directly fits what he's looking for or use the bow as is. Unless he can get a screaming deal on the bow or limbs.