Amazon.com has for their Prime Members: 5-Quart Havoline Conventional Motor Oil (5W-30) for $11.77 - $5 Rebate = $6.77. Shipping is free w/ your Prime Membership.
No longer available:
Amazon.com has 5-Quart Havoline Conventional Motor Oil (5W-20) for $11.77 - $5 Rebate = $6.77. Shipping is free with Prime or if you spend $49 or more.