Boots currently have L'Oréal men expert roll on deodorant half price from £2.75 to £1.37. Advantage Card members have a 25% off a £10 spend on men's products. But the glitch takes 25% off the full price i.e. £2.75. So I bought 8 for £5.44 which is 68p each. May be worth a try on other half price men's products.
Oh and there's a double points voucher available too