Needed to buy some of these for the stupid kitchen scales we bought from Asda which had no batteries that were meant to be included.
Asda own brand ones in red and black packaging
Should be £3.50
Scanned at the self service at 2p
Went back and bought 30 packets. Karma.
10 year shelf life, that should keep my kitchen scales going for quite some time as well as powering my battery eating 3D specs.
I'm not sure if this is a national price, but maybe worth a check if you are passing.