The M-B part # for the M271 4-cylinder Kompressor engine is 271-180-0009. The dealer quoted me a price of $9.25 for these filters. So far I have not found an aftermarket source for these filters that is significantly lower. Most suppliers don't carry them yet.
There is a filter kit listed with that part number for the C230 Sedan (2003-2004) as being available by Hengst with a manufacturers suggested list price of $9.00. We could offer the part at a slightly better price than you found from the dealer, but on this low margin item the dealer's price is not that far out of line.
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