Generally speaking I don't think the prices of MB parts is all that high. Sure there are exceptions and the general maintainance items can be purchased for much less aftermarket.

However today I priced a pint of Sunroof grease at the local dealer.........$60!!!!!!!!! which I thought was outrageous. AND they didn't carry the product in a smaller tube (like wheel bearing grease).

I ended up going to my mechanic who had a small bit left in an older can.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)