4 Wheel Drive/SUVs: rear wheel bearings, rear wheel bearings, jeep grand cherokee laredo

Question
Jeep Grand Cherokee Laredo 1998

I have been told that the rear  wheel bearings need to be replaced on my jeep (both inside and outside). The back end is definitely amiss.  My jeep has 130,000 miles on it.  The question is do you buy new parts or seek to replace parts with used ones. Benefits versus risk?  I have been quoted $1000.  Does this sound out of line.  
Thanks for any help.  I am a novice when it comes to cars.  My jeep has had no major problems

Answer
Michele,

Take the Jeep to a reputable shop, and get another estimate.  As far as new, or used goes, never replace bearings with used ones.  
When they say inside, and outside bearings, I have no idea what they are talking about, as there is a set of bearings in the differential itself, and a set of axle/wheel bearings that are pressed onto the rear axles.  The differential bearings are just that, and not called wheel bearings.   
It is unusual for both sets to go bad, unless the differential has run out of gear oil, or it has been run under water, and the oil has gotten water in it.  The differential bearings do go bad, but not as often as the axle, or wheel bearings.

Carl