This comes as the Poultry Industry Association warns the country is still around 400,000 laying hens short and it will be months before the situation improves.
A free-range egg business in Canterbury, Little Red Farm, said at the Ohoka Farmers Market it had been "absolute madness" recently, they had sold out of eggs only 20 minutes after the market started and last week customers had been lining up an hour before they opened.
Warkworth-based free-range egg farmer Phillipa Stichbury-Cooper told of a similar story at Matakana Farmers Market, with some customers showing up at 6am to secure a dozen.
"At the moment it's full noise... because it's holiday season all the cafes want more than they normally have, all the public want more... we've got people coming to the [farm] gate and buying eggs because nobody's got any eggs."
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Brogan White from the Old Fashioned Egg Company in Canterbury was receiving constant phone calls from existing and prospective customers, but it was impossible to quickly boost production.
She also believed the amount of coverage the shortage had received was prompting some people to "panic buy", exacerbating the shortage.
White said unfortunately a constrained supply of eggs had hit at a time when costs on farms were soaring, and those increases had to be passed on to customers.
"We've had major increases [in the price] of our feed, chicks... all of our running costs have actually gone through the roof and that's why a lot of these small free range farms are shutting down, because we just cannot make ends meet."
As word of New Zealand's depleted egg stocks has spread, Poultry Industry Association's Michael Brooks said, he was getting interview requests from international news outlets including the BBC, CNN and ABC.
Brooks said the country was still 400,000 laying hens short and egg supplies would remain tight for several months yet. Even though some farmers were buying more chicks, it took 18 weeks for them to start laying
"So that's May anyway... so we are seeing the chick numbers rising but it's going to take time."
It was a major concern Countdown and Foodstuffs were pushing ahead with plans to stop stocking colony cage eggs in their supermarkets by 2025 and 2027, Brooks said.
Colony cages housed 30 per cent of the national flock and had been endorsed by the Ministry for Primary Industries code of welfare for layer hens, he said.
Brooks said supermarkets should allow consumers to vote with their wallets: "Don't play moral arbiter, let customers make the choice."
Brooks has requested a meeting with Foodstuffs and Countdown to discuss the sector's concerns.
A Foodstuffs spokesperson said legislation introduced by the government to remove caged eggs by 2023 had temporarily decreased the overall supply of eggs.
The spokesperson said it would continue to work with the egg supply industry to smooth the transition and increase its offer in other types of eggs. "A number of Foodstuffs stores have put temporary limits on how many eggs customers can buy."
