Which Irish Supermarket is Actually Cheapest?
Tesco, Dunnes Stores, and SuperValu are the three big traditional supermarkets in Ireland. Most shoppers pick one and stick with it. But does the choice actually matter? I compared 9 everyday items across all three using prices as recorded in the MasterMarket database on 21 April 2026.
The answer surprised me.
The 9 Items I Compared
I picked everyday staples most Irish households buy monthly. Same brand, same size, at every store. I used loyalty card prices where available (Tesco Clubcard, SuperValu Real Rewards) since most shoppers have these. Aldi and Lidl were deliberately excluded — they're often cheaper on basics, and the question here is whether the big three actually differ from each other.
The items:
Same Price at All Three Stores
Three items sold for identical prices at Tesco, Dunnes, and SuperValu. No point switching stores for these:
Where Dunnes Stores Wins
Dunnes was cheapest on two items.
Chicago Town Pepperoni Pizza 645g
A €1.25 difference. If you buy this pizza monthly, that is €15 a year on one product.
Hop House 13 Irish Lager 8-pack
Dunnes was cheapest on both of the larger-ticket branded items in this comparison.
Where Tesco Wins
Cadbury Dairy Milk 110g
A 40-cent gap.
Where SuperValu Wins (with Real Rewards)
SuperValu's Real Rewards loyalty card is free to sign up for, and with it SuperValu was cheapest on three products.
Flahavan's Progress Oatlets 500g
Cadbury Hot Chocolate Powder 500g
Ballygowan Still Water 1L
The Total Cost of 9 Items
When you add up all 9 items using the best available price at each store (as recorded on 21 April 2026):
Tesco came out €2.59 more expensive than Dunnes on this small basket. As a rough projection only: if you bought this exact basket every week and prices stayed the same, that difference would add up to around €135 over a year (€2.59 × 52). This is not a measured saving — prices change and nobody buys the same basket every week.
What This Reveals About Irish Supermarkets
Three observations from this data.
No Store Dominates
No single supermarket was cheapest on everything. Dunnes won two items, Tesco won one, and SuperValu won three. Three items were tied. That means the cheapest shopping basket comes from splitting your shop across stores, not from picking one winner.
Loyalty Cards Do the Heavy Lifting
The SuperValu wins in this comparison use Real Rewards prices, so they only apply if you have the card. On this basket, having the right loyalty card mattered as much as which store you chose.
Tesco Is Not Automatically Cheapest
There is a common assumption that Tesco is the cheapest of the big three. This data says otherwise. Tesco was the most expensive store overall on this basket, even counting Clubcard discounts. Clubcard helps on specific items but does not consistently win.
How to Save More on Your Weekly Shop
Three practical takeaways.
Sign Up for Every Free Loyalty Card
Tesco Clubcard and SuperValu Real Rewards are both free to join. The SuperValu result in this comparison alone justifies the 2 minutes it takes to register.
Compare Before Each Shop
In this comparison, the gaps were small (€0.25-€1.50 per item), but they add up across a basket. Your own weekly shop is probably larger than 9 items, so the differences you see may be bigger or smaller.
Use a Price Comparison Tool
Manually checking prices across 3 store websites is slow. Price comparison tools like MasterMarket automate this — you search for a product and see the latest recorded price at each store side by side, with price history included.
Methodology
All prices were taken from the MasterMarket database on 21 April 2026, using the most recent scraped price for each product at the time. MasterMarket collects prices from the Tesco, Dunnes Stores, SuperValu, Aldi and Lidl websites twice a week.
Prices change regularly, so the specific numbers in this article will drift over time. This is a snapshot of one small basket on one day, not a general ranking of the stores.
You can run this same comparison yourself for any product on MasterMarket — searching and comparing prices is free.