THESE ARE THE CHEAPEST 1000mAh YOU WILL GET IN A SHOP YOU CAN PICK UP ON THE SAME DAY.
Its a 12 pack - so works out roughly the same price per battery that Aldi have for their 900mAh battery four packs - and cheaper than the occasional Lidl offering.
Cheaper deals are often available online - but you can get these locally 7 days a week (to the majority of the UK and Ireland).
You can check the link at the bottom of the page the link in the first post takes you to - to check local stock levels prior to forcing your bum out the computer chair.
This will also save you a fortune compared to normal batteries - and also each battery here is likely to save a sugar sized bag of little chemical AAA size bullets from entering a land fill.