Look it up in their mobile app. Tells you the aisle it's in and how many are in stock. If you still can't find it (it's not 100% accurate) then just show them

Look it up in their mobile app. Tells you the aisle it's in and how many are in stock. If you still can't find it (it's not 100% accurate) then just show them the app, with a convenient product picture and name. Has worked for me when buying slightly obscure items there.