Just bought 10 cases of M-1 at Costco for $24.00 a case. I will be submitting 10 M-1 rebates which will net me $100.00. Rebates are 2 per household so I am using 4 friend's addresses. (I'm a sly old dog) Oil will wind up costing me $2.33 a qt. The Wal-Mart 5 qt jug at $22.00 is $2.40 a qt. Anyone ever bought it for less than this? Just curious!