If you really look on the internet or at good parts stores you can buy any of several plugs for the ML's at around $4 or so. At the most they would cost about $80, including the Plats.

Unfortunately, most Mercedes dealers do rip off their customers, because a lot of Mercedes owners don't know much about their cars and have more money than brains. I go to the dealer to get small items, for which they overcharge me quite a bit (touch-up paint stick $12, small fasteners $3 each and so on). I don't mind paying people a reasonable profit on parts, but I don't like to be scalped. Fortunately, there are several good parts companies in the world who will sell at reasonable prices and still make a profit.

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)