For Prime members only, Amazon offers the Chevron Supreme 5W-20 Motor Oil 5-Quart Jug, model no. 220135474, for $11.77. This $5 rebate drops the price to $6.77. With free shipping, that's $16 off list price and the best deal we could find. Rebate expires February 28.
Note that it's expected to ship in one to two months.