AutoZone offers the Quaker State Oil 5-Quart Bottle or Jug (pictured) with an STP Oil Filter for $16.99. (Click "Shop Our Hot Deals" in the middle of the page, then "Filters and PCV" on the left. It's the first option.) Plus, get a free $10 AutoZone Gift Card via this mail-in rebate. Opt for free in-store pickup to avoid the shipping charge. Assuming you'll use the gift card, that's $15 under the best price we could find for similar items elsewhere. Sales tax is added where applicable. Deal ends February 4.