Replacement aluminum grill piece for sports package front bumper cowling

Where would I find a replacement grill piece for the sports package bumper cowling (right front aluminum with round holes) for a 2001 SLK 320? Some road trash dislodged it and I lost it. Are there any 3rd party wholesalers that would carry this or am I going to have to go through the dealer? Thanks.

You could probably get them from your mechanic, but they are rather expensive considering it is aluminum and it isn't that much metal.

http://www.allprocarparts.com/
http://www.formymercedes.com/slk-classR170.asp

See the link below that talks about other alternatives:
http://www.mercedesforum.com/m_22148/mpage_1/key_grill/tm.htm#22148