There's a rebate program going on for $3/iridium plug.
https://www.amazon.com/gp/product/B000IZ2AVE/?tag=gmtnation-20 $5 for the plugs, $3 rebate, ends up costing just $2/plug
https://www.amazon.com/gp/product/B000IZ2AVE/?tag=gmtnation-20 $5 for the plugs, $3 rebate, ends up costing just $2/plug