I picked up a couple of quarts of M1 SN 5W-50 at a Walmart near me.
I was surprised to see them since Mobil stopped selling the 5W-50 grade years ago in Canada and even Walmart in the use doesn't carry the grade.
The bottles had a "not for commercial sale" sticker on the back.
Anyway I checked the bar code and it said see a store associate which I did.
To make a long story short no one new what is was or where they came from or even what to charge for them. I said I wanted to buy them anyway.
After some negotiating I paid $4.98/qt for them.