I too have priced many parts at the dealer...I usually use this little formula to figure out what the part will actually cost me:
a= dealer price
c= actual cost

a(.25)=c

Yep, 75% markup....thats what I usually see...

I went in and bought a map light bulb for my s class, thinking how much could they possibly mark up a bulb....

The bulb was 16.00!!!!!

I nearly hit the floor....a .59 cent bulb...

Oh well, i guess part of the mark up revolves around having each part blessed by Mercedes as it enters the part shop....Id love to see what they actually pay for this stuff.

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1994 S320
131K miles

1998 ML 320
126K miles

1994 Blue C220
122K miles

Im going to Grad School @ the University of Iowa
Go Hawkeyes!!!