Oh my fellow Americans, I am so sorry Picard does not exist in the United States (Picard, if you see this, please select me to open the first US franchise!). It is THE frozen food store here in France with products that are made with fresh ingredients and specialties made by local regional producers (aligot, duck confit!).
They have great ready-made appetizers for last minute get togethers and tasty dishes, but I particularly love their chopped frozen herbs and fruits for smoothies. It is also one of the only places I can find raw shrimp and 'American'-style lobster year-round.
Trader Joe's is probably the closest thing we have in the States, but maybe someday Picard will decide to make their way across the Atlantic!