supermarket sweep

So i gota go to three supermarket now cos they all dont stock the stuff i want-

Tesco - best for cottage cheese and hard cheese. Rolls. Cereal.
Sainsbury- Horlicks, Quark cheese, Fjuii milkshakes (vanila)
Asda- Malt loaf, fjuii milkshakes (vanila)

why can i get all of that under one roof?