No bargain here, but I thought it was worth mentioning.
http://cgi.ebay.com/HALO-MASTERCHIEF-HELMET-AUTOGRAPHED-BY-BUNGIE_W0QQitemZ130019439256QQihZ003QQcategoryZ187QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/HALO-MASTERCHIEF-HELMET-AUTOGRAPHED-BY-BUNGIE_W0QQitemZ130019439256QQihZ003QQcategoryZ187QQssPageNameZWDVWQQrdZ1QQcmdZViewItem