For those who still own a car, Pennzoil has a $22 rebate (in the form of a Shell gift card) for the purchase of 5 quarts of various synthetic formulae. There is a wide variety of approved sellers, including Walmart and Amazon.
There may also be a rebate for those who farm out their oil changes (see the above link).
This seems like a pretty decent deal. I got 6 qts of 05-20 for <$7, delivered.