Filter to select the supermarkets in town

i like to shop in Aldi just a short distance away there is a Tesco and a morrisons. of course Aldi does not always have all the stuff we need, so we finish by popping into one of the other supermarkets nearby. it really bakes my cookie when i just bought something in one supermarket that i could have got at a lower price in the other! id like to be able just to see the prices in just the three supermarkets we use