Two shoppers "wasted police time and public money" by fighting over discounted food at an Asda store.
Greater Manchester Police said officers rushed to the scene due to concerns about a serious injury, but found "only red faces and childish behaviour".
They were called to the supermarket in Broadheath, Greater Manchester, on Sunday by security staff.
A police spokesman said instead of acting civilly two customers had decided "to scrap it out".
He said it caused "unnecessary distress to other law-abiding staff and customers [and] several urgent calls to the police".
Though no-one was injured, crime reports were taken which would "engage some of our patrols for a lengthy period".
"If you choose to treat yourself to a cheap discounted bargain, please be respectful in doing so," he said.
"Don't fight over a 10p sandwich when trying to save some dough."
There were no arrests or charges following the fracas.