Go and see your local mechanic mate.
I had my boot damaged out on a trip one day as well. Took it to a Jeep dealer and was quoted the same $1400 to replace the whole rear drive shaft. Went to see my local mechanic, he quoted me $120. So I went back to jeep, purchased the proper fuel tank guard and got the mechanic to fit both the rubber boot on the drive shaft and the tank guard for $150. Job done, no more worrying about the crappy plastic tank guard damaging the rubber boot.
The following week, I installed the transfer case and gearbox bash plates my self. Piece a cake.
Cheers.. Vlad.