Coles and Woolworths take 50 per cent off the prices of select groceries each week.
These bargains, called "loss leaders" in the retail industry, are not there to make money for the supermarkets. They are designed to bring people in, who will likely end up adding more profitable full-price items into their trolley.
Woolworths and Coles also use the half-price specials to distinguish themselves from emerging rival Aldi. The German challenger has its own weekly sale products, but they're never as heavily slashed as 50 per cent.
For your convenience, Yahoo Finance has selected the best half-price products from both supermarkets. You can compare them in one place to help you pick which retailer to shop at this week.
The following deals apply from Wednesday January 8 until Tuesday January 14 inclusive:
Woolworths: best half-price deals
Vittoria Mountain Grown coffee beans or ground coffee 1kg: $15 (better than half-price)
Mr Chen's pho or ramen kits 900g-1kg: $4
Blackmores Glucosamine Sulfate 1500mg tablets 180-pack: $26 (other Blackmores also half-price)
Raid Max Auto Prime Advanced insecticide 185g: $17.50
Bonds men's GuyFront Trunk underwear: $11 (other Bonds also half-price)
Biozet Attack Plus laundry powder 2kg or liquid 2L: $11
John Frieda shampoo or conditioner 250mL: $9
Dynamo laundry liquid 1.8-2L: $8.75
Garnier Olia hair colour: $8.50 (other Garnier also half-price)
Coles: best half-price deals
All brands of vitamins and supplements are selling for half-price this week at Coles.
Finish Quantum Ultimate dishwashing tablets 36-pack or 0% 42-pack: $16
Nature’s Own Odourless Fish Oil 2000mg capsules 200-pack or Glucosamine Sulfate 1500mg with Chondroitin 100 tablets: $15
Mortein NaturGard Multi-Insect indoor automatic spray Prime Eucalyptus: $15
Swisse Ultiboost Magnesium, Calcium + D3 120 tablets: $12.50
Omo Ultimate laundry powder 1.8kg or liquid 1.8L: $11
Centrum for Men 60-pack or Centrum for Women 60-pack: $10
Blackmores Fish Oil Odourless 1000mg capsules 200-pack: $10
Nature's Way Adult Vita Gummies multi-vitamin 120-pack: $10
L'Oréal Préférence hair colour: $9.65
Luv-a-Duck frozen whole duck 2.1kg: $11.50
Naturopathica Fat Blaster Less Sugar chocolate shake 430g: $10
Gold'n canola oil 4L: $9
Atkins Endulge bars caramel nut chew 5-pack 170g: $6.75
Pacific West cocktail spring rolls 1kg: $5.77
Häagen Dazs ice cream 3-pack: $5
Robert Timms coffee bags 28-pack: $4.82
Mount Franklin spring water 12x500mL: $4.80
La Española olive oil 500mL: $4.50
Peters Drumstick ice cream 4-6 pack: $4.20
Steggles chicken breast tenders 400g: $3.97
Some of the links in this article may return revenue to Yahoo Finance Australia.
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