Without a doubt Walmart is one of the cheapest places to buy M1. In my area it is about $22 for a 5 qt jug. Does anyone feel the power of Walmart to set pricing forced XOM to cheapen their cost in making M1. I know XOM makes billions, but like any large corporation, the M1 department could be far less profitable and come under pressure. They could have been mandated to get their product to a certain profit margin, and couldn't do it without cutting their cost in making the product. Pure speculation, but we've seen Walmart force the hand of other corporations.