In hardly any category do prices fall as fast as with robot vacuums — and in hardly any is the gap between two generations as small. Here, timing beats specification.
Up to 15 per cent permanently on things that run out anyway — the subscription discount is the most underrated saving route. But only as long as you keep an eye on the price.
With washing machines, fridges and dryers the price is not decided by the percentage on the label but by ten years of electricity bills. Here is how to add both up.