Walmart or Costco often has sales on Mobil One or Pennzoil Platinum, which often coincides with a rebate from the manufacturer.
By buying on a routine sale (the kind that happens frequently throughout the year) and by submitting the for the $10-12 rebate ; I have been able to keep stocked up on either PP or M1 for less than 3 dollars a quart.
For example I just bought a 5 quart jug of Mobil One 5w-20 for 22.88, add 8.25 percent tax to that, minus 10 dollars for the rebate, and then divide by 5 (for the number of quarts in the jug) and I paid $2.95 a quart.
22.88 x 1.0825 - 10 / 5 = 2.95352 dollars per quart.
These are not boutique or truly special oils, and I have seen others bragging about getting some real once in a lifetime deals out there, which this is not of course. But I have been able to do get a decent synthetic for less than 3 dollars a quart out the door at local stores, without any more hassle than submitting a rebate.
I honestly do not understand the point of the no-name conventional oils out there that are always more per quart, and are never being on sale or rebate.
If I had a problem motor with a known weakness that I thought that a real synthetic would solve than I would do that. But my engine does really well on the pedestrian stuff according to Blackstone reports so I do not see the point of spending the extra money.
If a regular conventional oil provided adequate protection for a noticeable amount of money less, then it would be worth considering. But I have yet to easily find a respected conventional for a dollar a quart. Maybe if I go hunting the auto part stores at the end of the year I could come up with a worthwhile conventional someday.