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Phone chargers, headphones, USB cables and extension leads are the kind of small tech buys grabbed at full price out of convenience, even though supermarkets discount them regularly. We track Energizer, Duracell and own-brand electricals at Tesco, Sainsbury's, ASDA, Aldi, Morrisons, Co-op, Waitrose, Iceland, B&M, Boots, Superdrug, Savers and Ocado (including M&S). Check here before you reach for a cable at the till, the cheapest version this week is right in front of you.