Walmart offers five quarts of Havoline Motor Oil in 13 varieties from $8.24 after this mail-in rebate. (Amazon offers many of these items for the same price for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping fee. You can choose from 1-quart and 5-quart options, but the total must be at least five quarts. Rebate expires April 30.