Shampoo, shower gel, deodorant, razors, toothpaste and skincare rotate through promotions almost every week, with swings of 30 to 50 percent on bigger brands. We compare Nivea, L'Oréal, Gillette, Colgate, Dove, Head and Shoulders and more at Tesco, Sainsbury's, ASDA, Aldi, Morrisons, Co-op, Waitrose, Iceland, B&M, Boots, Superdrug, Savers and Ocado (including M&S). Stock bathroom essentials when they're on offer rather than at full price and trim the weekly shop without changing a thing.