It's on roll back on line and shows available. Walmart is not likely to squeeze Castrol too hard for price on Edge, the fierce competition with SOPUS and Mobil for premium Walmart shelf space is plenty effective enough for that.
could be people stealing it
with their auto replenish type ordering system unless someone manually tells it the inventory count
it might still think they have a bunch and not order any(or order 2 instead of 6)
Castrol is ALWAYS $3 to 4$ more per jug than the equivalent grade / rating of Pennzoil , Mobil 1 or Valvoline synthetic oils at WM ... *I don't believe Castrol is worth paying more for - so I don't care if WM carries Castrol or not .