I just got in on 4 of these (Max allowed) for $5 minus $3 mail in rebate. This is a REALLY good deal, however, it looks like they won't ship until end of the month/ early May. This is fine with me as I have a WIX to get me by for now.
Here is the link to the Rebate form and Amazon.com for the 4 cylinder filter (I am sure 6 cylinder is on there but didn't have time to look up)
Rebate:
http://www.purolatorautofilters.net/promotions/Pages/PurolatorOilFilterRebate.aspx
4 Cylinder Filter:
http://www.amazon.com/gp/product/B000E8V9TE/ref=ox_ya_os_product
Here is the link to the Rebate form and Amazon.com for the 4 cylinder filter (I am sure 6 cylinder is on there but didn't have time to look up)
Rebate:
http://www.purolatorautofilters.net/promotions/Pages/PurolatorOilFilterRebate.aspx
4 Cylinder Filter:
http://www.amazon.com/gp/product/B000E8V9TE/ref=ox_ya_os_product