Congrats on the window regulator being fixed. But I think I got you beat on the cheapest MB fix.
Took ML320 to dealer last week for annual state inspection, had soundpanels reglued, and AAM foglight codes enabled.
Okay, the soundpanels were done under warranty so that's cheating, but I have NEVER gotten out of the dealership that cheaply!!! Usually, my wallet hurts!