I don't see how a 10mm top hat spacer that comes standard on 200's around the world would cause vibrations!? Are you referring to wheel spacers, if so I could see that if they were cheap knock-off's or if they weren't properly torqued. My install was an independent shop who specializes in doing lifts, not a stealership.
The spacers themselves sell for $70-80 online all day and most alignments are $75-130 depending on the shop. If your shop is charging 3.5 hours labor to open the KDSS valves, remove the front tires and unbolt the coil over and then reassemble then they are taking you by the balls. My shop did it with floor jacks in under 40 minutes and one guy did 80% of the work.