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 live price data pulled on April 21st, 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 well-known to be cheaper on basics, and the real question 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 pulled ahead on two items with genuine discounts.
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 consistently cheapest on branded larger-format items during this comparison.
Where Tesco Wins
Cadbury Dairy Milk 110g
A 40-cent gap. Tesco's strongest category tends to be snacks and confectionery.
Where SuperValu Wins (with Real Rewards)
SuperValu's Real Rewards loyalty card is free to sign up for, and it completely changed the picture for 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:
Tesco came out €2.59 more expensive than Dunnes on this small basket. Over a year, if you bought these exact items weekly, that is around €135 in savings.
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 only happen with a Real Rewards card. Without it, those three items cost €2-4 more, flipping SuperValu from second-cheapest to most expensive. The loyalty card matters more than the store you choose.
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, SuperValu Real Rewards, and Dunnes Points are all free. The SuperValu result in this comparison alone justifies the 2 minutes it takes to register.
Compare Before Each Shop
Product-by-product price differences are small (usually €0.30-€1.50 per item), but they add up. A 9-item test showed €135 in potential annual savings. Your real weekly shop has 30-50 items.
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 all three store prices side by side, with price history included.
Methodology
All prices were pulled from the MasterMarket database on April 21, 2026. Data is collected via automated price scraping across Tesco, Dunnes Stores, SuperValu, Aldi, and Lidl websites, with freshness verified to be within 3 days for all products in this comparison.
Prices change weekly, so specific numbers in this article will drift over time. The pattern — that no single store consistently wins, and loyalty cards matter more than store choice — tends to hold regardless.
You can run this same comparison yourself for any product on MasterMarket — it is free to use.
