A landmark nationwide investigation by consumer advocacy group "Choice" has officially revealed that German discount giant Aldi remains Australia's cheapest major supermarket chain.

The dynamic study, which deployed mystery shoppers to cross-reference a basket of 14 everyday grocery staples across 104 distinct regional stores, comes as millions of working families look for immediate relief against severe, ongoing cost-of-living pressures.

According to the newly finalized data, Aldi's baseline grocery basket totaled just $55.35 AUD, significantly undercutting its primary market rivals.

In sharp contrast, identical product bundles cost $58.92 AUD at Woolworths and $59.22 AUD at Coles, while independent IGA outlets ranked as the most expensive, averaging a steep $69.74 AUD.

This exposes a massive price difference close to $10 between the cheapest discount chain and standard supermarket options.

Federal consumer advocates emphasize that changing where you buy your weekly groceries remains the fastest analog method for households to scale back monthly operational deficits.

Regulators decided to release these comparative price sheets to stimulate healthier market competition, urging shoppers to utilize unit pricing strategies to completely neutralize corporate grocery inflation.