A new one on eBay for the 280C series, but you may have the same clutch...

http://cgi.ebay.com/ebaymotors/NEW-Mercedes-AC-clutch-280-280C-280S-280SE-280E-280CE-_W0QQcmdZViewItemQQhashZitem4cf0127276QQitemZ330445255286QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries

$150

Also, in the Parts section of the forum, some people are parting out a few of these era cars and may have what you need at a lower cost if you are willing to take the risk.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)