These cost £4 per 1 x 300g carton at Asda (or 3 for £10) or £3 at Morrisons, so Tesco wins hands down, giving you 2 big'uns (300g cartons) for £4.
Copy and paste the link below if the GET deal link doesn't work: http://www.tesco.com/groceries/product/details/?id=293703890
Individual packet price of £3.25 each - but this deal gives you a massive 600g of Kinder chocolate fun for £4, effectively 67p per 100g (vs £1.09/100g). You read that right - just 75p more for another bag.
These are the larger 300g packets, not the 100g/200g packets you get elsewhere (eg poundshops) - 104g costs £1.50 at all the supermarkets.