I got 4 packs of batteries today (2 x 4 AAA and 2 x 4 AA packs) from Tesco's Instore today. They were mix and match in the offer, had the round batterys, big C batteries and all A size batteries in the offer. Got my batteries for Xmas, suppose to be £11.96, got 4 packs for £5. Bargain!
Its advertised online on Tesco direct, but their banner image link doesn't go anywhere?!? So not sure if it is honoured online or not.