A survey comparing prices at some of Ireland's most popular supermarkets has found Aldi is up to 47% cheaper than its rivals.
Grant Thornton looked at the price of groceries at Aldi, Lidl, Tesco, SuperValu and Dunnes Stores.
It found that a basket of 62 own-brand products is more than 17% cheaper in Aldi than Tesco, over 24% cheaper in Aldi than Dunnes Stores (after taking into account their €10 off €50 voucher offer) and up to 47% cheaper in Aldi than SuperValu.
The sample grocery basket was found to cost on average €65.04 in Aldi, €65.53 in Lidl, €76.54 in Tesco, €80.74 in Dunnes Stores and €95.50 in SuperValu.
Some of the biggest differences included Cherry Vine Tomatoes at €4.98 in Supervalu, costing just €1.69 in Aldi.
Supervalu says it is "unclear which products were used in comparisons", pointing out that it has Cherry Tomatoes on sale for €1.58.
A Vintage White Cheddar costing €4.99 in Dunnes Stores, was priced at just €1.59 in Aldi, while a €3.38 Orange/Apple Juice pack in Tesco cost just €1.25 in Aldi.
The comparison of grocery prices | Source: Grant Thornton
The random sample included strawberry jam, fresh cream, honey, ice-cream, rice, orange juice, cheese, yogurt, soda bread and a wide range of fruit and vegetables including cucumbers, mushrooms, apples and broccoli.
Damian Gleeson, head of retail at Grant Thornton, found that "there are huge differences in pricing of similar comparable products across the board, with significant savings to be made by consumers by shopping at Aldi in particular."
"Aldi offered the lowest prices on general everyday groceries and was up to 47% cheaper than SuperValu, which is the most expensive supermarket surveyed."
In a statement, SuperValu questioned "the validity of the comparisons used."
The supermarket said its key aim is to support Irish suppliers and communities across the country.