I agree that Costco was the cheapest place to get a quart of heavy cream.
At the end of the cost spectrum:
In case anyone's trying to save themselves a last minute trip to the store, I just bought a cup of shelf-stable whipping cream at Trader Joe's. I think it was 1.99, which is steep, but I figure it will be saving me time and money when I have that moment of panic just before guests arrive. It's sitting on my pantry shelf next to the shelf stable milk I pick up every fall so that I won't have to run to the store when snow is forecast.