Pak'nSave has emerged as the cheapest supermarket in a survey done by Consumer New Zealand.
Woolworths was the most expensive supermarket in the survey, with New World and Countdown in the middle of the field.
Consumer New Zealand sent undercover shoppers to buy groceries from supermarkets in six centres.
They bought items from a list of 40 top supermarket products, including bread, milk, cheese and butter.
The survey found Pak'nSave was consistently cheaper than any other supermarket chain.
Foodstuffs managing director Tony Carter says the survey results are no surprise.
Woolworths says the results are surprising and disappointing.