I had an aftermarket (Pilkington) glass put in my 88 W124 for $149 and the Owner of the shop said the Mercedes glass would have been just under double that. I had them put in a mercedes glass on my C230 and the cost was $239 about $80 more than the aftermarket. The shop was a Speedy Auto glass franchise.

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Dave
88 300E 250K Sold
2000 C230K Totaled @104K
2003 ML320 156K Sold
2009 E350 4Matic Sport 46K Sold
2011 ML350 60K Sold
2014 GLK350 46k Sold
2012 GL450 67K
2016 E550 Cabriolet 48K