We're not usually given directions that are so specific.
Q - Where are the eggs?
A - Aisle 12.
If I had to give any more information, I would say they were at the bottom, middle or top of an aisle. Generally, the bottom is the part of the aisle closest to the tills (which are usually at the front of the shop) and the top of the aisle is towards the back of the shop.
Student or Learner