I went into Boots Sheffield High st and saw economy packs of AA Duracell (upstairs by the photo counter) with a sale sticker marked £5. I bought a pack and it scanned in at £2.50. I pointed this out to the sales assistant who told me that that was indeed correct. I don't know if this is a national deal but it is worth a check if you are in Boots. The Sheffield High st store had loads in stock. Underneath the £5 sticker was a "Now £10 save £3.35" sticker so a pretty good bargain if you ask me.