Local shop here in south FL has a rebiult one for $100 (20 dollar core).  To
buy brand new bearings is more than that, like 120 with boots, grease.
Every mechanic I talk to says its better to buy new bearings as rebulit ones
are just old ones honed out with bigger bearings (is this true?).  My father
and I rebuilt mine myself and did the work with 2 hydrolic jacks and stands.
My friend Matt had needed new bearings in his 91 like 2 months after that. We
used a pit that time making it a little easier, took us a couple hours.
Its not a hard job to do yourself  its just a pain in the ass, and time
consuming.   Helps if  you have all the tools, but it is ALOT easier if you
have a lift.
Hope this info helps, sorry never quoted for the shop to put it on.  Only let
them do it if I MUST, they are NOT CHEAP!!

Tim
87Wolfsburg