Can’t believe no one has mentioned the Bacon.
Foil has been mentioned. It’s amazing quality and seems to last a long long time.
We think the Pasta im there is a notch above anything else - but the organon not so much.
Chicken breast used to be good (price and texture) but it’s gone the way of the other supermarkets sadly - up and downhill.
Keep an eye out for their fillet steaks. It’s a whole fillet, so will need carving up and freezing, but it’s great value.
beef Flank - i suspect a lot of Chinese restaurants use Costco flank. So if you make this at home or enjoy playing with spices - it’s perfect when sliced thinly.
Pesto - great vfm, better than supermarket quality.
Fuel. If you are going that way.
Tyres.
Sugar is cheap.
Goats cheese is high quality.
The in store pizza is tasty and the fridged one is damn decent too.
Mozzarellla Sticks.
Laundry Powder etc. all usually better value than supermarkets, even when on offer.
As with other posters - know your prices before you go and always check unit prices and figure out the vat.