After five weeks in third and second places, Asda has managed to claw its way back to the top spot this week.
A vicious round of price cuts and a muscular promotional push has caused Asda's total shopping basket to plummet by £2.13, enabling it to reclaim the cheapest 33-item shopping basket at £37.61.
This week's deep price cuts also meant that Asda claimed the cheapest average shopping basket of the six other retailers, despite only coming in first place once in the four-week period.
Asda's own label kippers, Australian red wine and Old El Paso Fajita dinner kits were among those items whose price tags received a sharp snip this week.
Our mystery shopper at Asda's Bridgwater store also spotted a staggering 14 deals and money-off promotions on The Grocer 33 list this week.
At £40.21, Sainsbury's basket price was identical to the one that it presented last week.
However, it still managed to claim the position of second cheapest supermarket, narrowly beating Tesco by 2p.
A number of Tesco's promotions drew to a close this week, causing its total basket price to rise 82p.
The price of Old El Paso Fajita dinner kits rallied by 87p, returning to their normal price of £2.65. Meanwhile the cost of Tesco's class one Iceberg lettuce rose to £99p, up from 74.
However, Tesco claimed the second average cheapest shopping basket for the duration of our current list, which is set to change next week.
Morrisons was in fourth place on the pricing tables this week, with its basket costing £40.48.