Transfer Case on 2000 Jeep Grand Cherokee

I have had non-stop problems with the transfer case leaking.

Asked by for the 2000 Jeep Grand Cherokee
Got this info from our common problems page for your vehicle
Leaks at the front/rear differential pinion seals and from the transfer case are common. Leaks from the transfer case normally occur at the case-mating surfaces and require removal of the transfer case to reseal.
I have the same problem with my 2000 4.0L Cherokee. How much should this leak cost to repair?