These are almost certainly contract prices for the store. "Just in time" is not compatible with retail grocery stores. The real parsimonious angle is the cost

These are almost certainly contract prices for the store. "Just in time" is not compatible with retail grocery stores. The real parsimonious angle is the cost of refrigeration changes on hot days. Although that means ice cream should be 25% of it's original price during the dead of winter. And I haven't seen an ice cream truck with a digital price sign. Yet.