AZ is also really overpriced compared to WM.
Yes they are, but Rotella gas truck is on clearance there for $20 for 5qt. jugs. Shell rebate of $10 per 5qt makes it $10 in the end. And with a limit of four jugs, that's 3 oil changes plus 2 quarts left over for $40 plus whatever the filter costs. That's a pretty good deal.
Of course Wal Mart has them for $21 and some change now as well.