Too many variables such as--
Dealer or Indy shop
Rebuild it all or replace or some of suspension
Front and/or rear
OEM or OE parts
You provide parts or they purchase
labor rate

I would say this--I would swallow hard when they told me the price of the suspension work. I would throw up when they told me the price to replace the valve seals. Certainly it will be very important to find a Independent shop with a great reputation.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas