Walmart offers five quarts of Quaker State Motor Oil from $9.97 after this rebate. (Amazon offers many of these items for the same price with free shipping for Prime members. The starting price and rebate amount vary based on the type of oil you buy.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's $2 under our December mention and the best price we've seen for any Quaker State oil in this quantity. You can choose from 1-quart and 5-quart options, but the total must be at least five quarts. Rebate expires December 31.