Countdown's "Price Lockdown" promotion for bread resulted in the chain's Homebrand white and wheatmeal bread drop from $1.48 to $1.00 on July 18, with a customer limit of four loaves per shop.
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Foodstuffs marketing general manager, Steve Bayliss said it has been a challenging year for Countdown and 'reaching for the price lever aggressively' to regain lost ground was not surprising.
While customers are the big winners from the price war on bread, Bayliss says this comes with a warning.
"We don't believe the current pricing is economically sustainable long term and prices will eventually rise."
New World's "Price Limits" promotion offers Budget brand 600g loaves also for $1 with a limit of five.
"In a hyper competitive market, where no brand wants to give the competition an inch, we're unlikely to see pricing tensions easing in the near term," he said.
Some critics have labelled the cheap bread promotion as unhealthy.
Tauranga nutritionist Angela Frieswyk said she recommended most clients stay away from bread, especially white bread, as much as possible.
"I would prefer to see places like supermarkets discount veges," she said.