Let us specify supermarket priority/exclusion

I mostly shop in Tesco and go to Waitrose, Sainsbury or Morrissons only for offers. Asda is a long way away and Ocado is not an option at all. If a product on my list is at it's lowest price in, say, Tesco, Asda, Morrissons and Ocado (including taking account of loyalty card membership) then I need it to show up listed under Tesco rather than Morrissons or Asda, and definitely not Ocado. It would be a nice feature to be able to prioritise stores and exclude stores. In my example Tesco would be 1, Sainsbury 2, Morrissons 3, Waitrose 4, Asda 5, and Ocado would be X.