I would think $300-400 would be a VERY conservative estimate.

After standing my ground with MB, I was able to get my rear window replaced...they covered the bulk of the labor and materials, and I was out $340. And that's just for the rear portion of the top! They claimed there part of the bill was $1200 (mostly labor).

Prices on the internet for the rear portion ran around $300, but I believe it's closer to $800-$1000 for the complete top. And I have no idea what labor would run.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car