A McDonald's NZ spokesperson told the Herald that they can't prevent people from selling their product for profit.
They added due to the excitement of the launch most stores temporarily ran out of stock.
"Restaurants are in the process of being restocked with the remaining stock of sauce over coming days."
The fast-food franchise wouldn't confirm how long stocks would last.
When McDonald's NZ first made the announcement, they said the Szechuan sauce will be available only in New Zealand for a "limited time", with 200,000 pottles available to Kiwis.
"We wanted to give Kiwis the chance to try one of the rarest sauces in the world," McDonald's New Zealand Managing Director David Howse said.
"There are 200,000 units of sauce, so that works out to be approximately 1 sauce for every 25 people."
To complement the return of the Szechuan, McDonald's has launched the 50 piece Chicken McNuggets sharebox.
Szechuan sauce was originally released to promote Disney's Mulan 1998, but it created a frenzy in the US when it featured an episode of Rick and Morty in 2017.
In the episode, Rick raves about the delicious sauce as he tries it for one last time during a dreamscape.
In 2018, when McDonald's re-released the sauce, Rick and Morty fans rioted at US stores as demand outweighed supply.
At the time police were called to at least one restaurant after hundreds of people queued outside restaurants demanding the sauce at 4am.
Meanwhile, others made an outrageous profit with the sauce as one woman traded her 2003 Volkswagen Golf for one packet of Szechuan sauce, while another person sold a packet for $24,000.
