[Columbine]

I don't know if it's the same for all supermarkets, but my local one had a 'sale' on wednesday afternoon when basically almost everything perishable was sold off (usually nothing wrong with it, but they shut Thursdays) and prices dropped. You had to fight off the old ladies for the good stuff but if you timed it right you could shop a week's stuff for half or only 2/3rds of the usual cost.