The two cheapest listing for sets of 6 ACDelco 41-103's as of this posting: http://www.ebay.com/itm/SET-OF-6-AC-DELCO-41-103-IRIDIUM-SPARK-PLUGS-12625058-/112287043752?hash=item1a24d450a8:g:lhgAAOSwNnRYmXIl&vxp=mtr...