From my bill for repair:

Labor 480.00
Parts 386.95
tax 60.69
Total 927.64

"Ignition lock mechanical failure, performed inspection of ignition lock, R&R steering wheel, left underdash panel, steering column switche, cut out old ignition lock assembly, replaced tumbler, lock, key buzzer, and electrical switch."

Parts & cost (1 of each):
124-462-20-30 Steering lock 180.70
201-462-02-23 Cover steering 33.15
202-545-01-04 Ignition switch 68.98
124-545-02-14 Switch, ignit 25.38
126-460-02-04 Lock Cylinder 78.74

I believe the 800.00 you were quoted is for the entire job, parts and labor, similar to mine. There's probably no shop rate difference, but I'm in NJ and the work was done at an MB auth. dealer.