Try other wreckers. Even with shipping you can easily beat that price. I'm sure there's a lot of wrecks out there with no key to the cylinder, making for a difficult to sell part. Heck, you can buy a whole door with a lock here.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1860362859

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)