Viking have what they call a sale! but it's not that great really but they do have 1 deal which I think is quite tasty. Normally this pack of 12 costs £3.99 inc. Vat but they have slashed the price to £2.49 and are doing a BOGOF so after vat it works out at 12.2p per battery. Compare that to other offers on Hotdeals and it works out at around 30% cheaper.
The only catch is delivery, they charge £2.90 but if you can go crazy and purchase 264 batteries then you get free delivery for the £30 spend.
This offer is ideal for people who are looking to sell these on ebay, or at car boot sales.