$100 plus shipping. New rear diff guard from Tactical Rovers.....LINK.
These are currently out of stock. Probably the best built units I have seen in a while. Tabs will require welding.
$85 plus shipping. Used universal diff guard from Equipe. No welding required.
Pick up in Fullerton CA or e-mail me your zip code for shipping price. Bolts that secure protector to diff not included.