Amazon.com has 5 Quart Havoline 5w-20 High Mileage Conventional Motor Oil for $11.98 - $5 Rebate = $6.98 AR. Free shipping for Prime members. The $5 Rebate also applies for their regular Conventional and Havoline Synthetic.
Here is the link. Note the photo shows a picture of a single quart but the description says 5 quarts
Link to fill out Rebate form. It is the 2nd one down.
Valid until 08/31/2016. Must purchase at least 5 quarts. Can be the single quart or the 5 quart jugs. Limit $15 in rebate per person/household. Rebate can be submitted online.