I feel your pain MTN...A was also hit and run at our Costco Store about a month ago. I bought my new replacement rear bumper(painted) at Online Body shop(Ebay).
http://cgi.ebay.com/ebaymotors/2008...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
http://cgi.ebay.com/ebaymotors/2008...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories