In a time where every penny counts, savvy shoppers are constantly on the lookout for ingenious ways to trim their grocery expenses each week.

TikTok user @SydneyTamrin recently shared his own money-saving tip on the popular platform, revealing how he got over $100 in refunds from Coles supermarket thanks to their Promise on Price Scanning rule.

According to Coles’ policy, if an item scans at a higher price than what’s displayed on the shelf, you get it for free.

During his first trip to Coles, he scored big with a $48 discount when a pack of dishwashing tablets rang up at the wrong price.

“Notice how the first line of 74-pack of dishwasher tablets is free?” he began the video

“This is why it pays to take notice of prices while you’re shopping.

“Most people don’t know this, but all of the major supermarkets are bound by something called the Supermarket Scanning Code of Practice – as it’s generally known.

“And in that code, there’s a caveat where if you scan an item and it scans at higher than the ticketed price, you get it for free.

“So yeah, I just saved $50.”

@sydneytamrin I just got a $48 item for FREE at Coles ???????? Here's how…. #fyp #moneytok #moneytips #hacksandtips #coles #supermarket #australia ♬ original sound – Sydney Tamrin

In a follow-up video, he went back to the store the next day and bought two more packs of the dishwashing tablets. To his surprise, they were scanned with the wrong price and he was able to secure another refund.

While the method saved the customer big bucks on his recent trip to the shops, not everyone was convinced by the merit of the loophole.

“It’s always an argument at Coles and Woolworths to honour this policy. they always just try to give it to you at correct price,” one user wrote.

“I get lots of items for free, but without a docket.”

“Yeah its true, pretty rare to happen and boy do they fix it quick,” commented another.

“You have to pay for it first and then go to the front counter and tell them they over changed you, then you’ll get a refund and the item for free.”

A Coles spokesperson told 7NEWS.com.au that the supermarket is more than happy to offer the policy to its customers.

“All Coles Supermarkets apply ‘Our Promise on Price Scanning’ to ensure confidence in the pricing accuracy at our registers,” the spokesperson said.

“If a single item scans at a higher price than the advertised or ticketed shelf price for that item, we will give the customer that item free.

“Our Promise on Price Scanning goes above and beyond the requirements of the Australian Consumer Law, which requires businesses to refund the difference between any overcharged amount and the correct price of the item.”

In addition to possibly scoring a surprise refund on supermarket items, Aussie shoppers are using another savvy method to save at the checkout and keep more money in their wallets by opting for generic brands over the more popular name brands.

Recent research from Compare the Market highlighted the growing trend, finding that nearly three-quarters of Australians have chosen the generic option over the more popular name brands during their weekly shop in the past 12 months.

Compare the Market’s study found that the generic version of items such as pasta, cheese, teabags, and bread came in at half the price of the popular name brands.

“A lot of people are feeling the pinch and are looking for more ways to claw back cash,” Compare the Market spokesperson Phillip Portman explained to 9News.

“If you are willing to make that switch, there are savings there.”