A person who tested positive for COVID-19 visited PAK'nSAVE Glen Innes on Wednesday, August 12.
PAK'nSAVE says the customer visited the store for approximately half an hour.
"The customer was asymptomatic at the time, so risk to customers and staff is considered low," the store says on Facebook.
"Advice to customers is that if you were in store at any time on Wednesday 12th August, please be vigilant for COVID-19 symptoms."
These include a sore throat, new or worsening cough, fever, temporary loss of smell, or difficulty breathing.
"Anyone with concerns should call Healthline on 0800 358 5453 - this is a 24/7, free service with interpreters available if required," PAK'nSAVE adds.
"The health and safety of our team and customers is our top priority, and the team at PAK'nSAVE Glen Innes have been in contact with ARPHS to ensure all best-practice protocols are being followed. Heightened health and safety and cleaning measures are in place at the store."
Another confirmed case was at the Mt Roskill Primary School in the 24-hour period between 1:40pm on August 10 and 1:40pm on August 11.
Anyone who visited this location during that period should be aware of symptoms and seek a test if they become symptomatic.
There have been 13 new cases of COVID-19 reported in the community on Tuesday - 12 linked to previous cases in the cluster.
This brings New Zealand's total number of confirmed cases of COVID-19 to 1,293.
This article was amended on August 18 because it incorrectly stated that the person who tested positive for COVID-19 had visited PAK'nSAVE Glen Innes multiple times. This was incorrect information supplied by the Ministry of Health.