Just doing the weekly shop & in ASDA Rollbacks it has
DORITOS (Original & Tangy Cheese) at 54p (but when you click on it, there's an offer of "Doritos 2 For £2", which makes me think it is a misprice)
Don't know i it is instore as well but I've added them to my homeshop!!
Same applies to Walkers SENSATIONS - Thai Sweet Chilli & Oven Roast Chicken & Thyme