My favourite supermarket.
Here is what I like to do when it is freezing:
Look and the flyer online and construct my weekly shop based on what is cheap. Then email my order to them, have them pick everything out and deliver it. This makes grocery shopping as effortless as ever and reduces the energy it takes to figure out what to make in a given week. Orders are usually 50 bucks with three heavy bags full of fresh produce, meat, and a few cheap pantry items.
This is the place for you if you want fresh food- if you want cheap packaged food you will probably do better elsewhere unless what you want happens to be on sale that week.