Police in the Bay of Plenty believe milk is being stolen to order there.
More than 600 two litre containers of milk have been stolen at night from distribution trucks at a delivery and storage company in Totara street in Mount Maunganui in the past week.
Detective Sergeant Darryl Brazier says large quantities of cream and other dairy products have also been stolen.
He says the thefts have occured on three separate occasions.
Retailers who have been offered discounted milk in the past few days, are urged to call the police.