autozone has the "STP" branded ones for $5 as well now... I just bought the "XL" version of the stp filter for $10 from there since I just changed my oil 2 days ago because. Like the "STP" branded oil the filters are someone elses just rebranded.. the STP oil currently approved for our trucks is the exact same oil also sold as "Fram" oil by some autostores. It this stuff rebranded.. http://www.amalie.com/Heavy-Duty-Diesel/XLO-Ultimate-Full-Synthetic/5W-40. many are running it now since T6 is difficult to find.I buy the 5.00 0nes from e Bay no problems