WoWza I have no clue what this means!?!? Are "Big Y" and "Stop and Shop" the names of the stores in your area? Where are you from? Ha you thought you were the one asking the questions didnt you???
We have Albertsons, Vons (Safeway) here in San Diego and I notice an average 20% higher at Vons opposed to Albertsons or Ralphs. Maybe your stores are owned by a larger chain and thats why I dont know the names you mentioned. Sorry I am no Help to You.