Aldi is more likely to sell cheaper groceries than supermarket giants Coles or Woolworths but it's not always the best value.
Consumer group One Big Switch analysed 31 popular everyday goods ranging from fruit and shampoo to eggs and laundry detergent.
While the supermarkets don't have cheap days, campaign director Joel Gibson said consumers would have less competition if they shopped early in the week or after hours.
'The prices don't change by day but there are fewer crowds on Mondays and Tuesdays, and you sometimes get end-of-day discounts on stock if you shop at night,' he told Daily Mail Australia.
Mr Gibson, the author of Kill Bills, said supermarkets sought to clear out perishable items at night and launched new specials on Wednesdays, when they all distributed a new catalogue with weekly deals.
German chain Aldi, which came to Australia in 2001, was the cheapest in 12 categories of the 31 compared.
Aldi is more likely to sell cheaper groceries than supermarket giants Coles or Woolworths but it's not always the best value. Consumer group One Big Switch analysed 31 popular everyday goods ranging from fruit and shampoo to eggs and laundry detergent (pictured is an Aldi at Fairfield in Sydney's south-west)
On the fruit front, Aldi is selling a 1kg watermelon for $1.49, three avocadoes for $2.97
On the fruit front, Aldi is selling a 1kg watermelon for $1.49, three avocadoes for $2.97 and 750g bananas for $2.49.
It also had the cheapest free-range eggs, sausages, corn, ham, biscuits, red capsicums, cheese, olive oil, and bin bags.
Coles and Woolworths were each cheapest in seven
