£2.99 for 10 9 volt batteries

[M600]

found this on ebay, they expire next year though

http://cgi.ebay.co.uk/10-MEMOREX-9V-BATTERIES-1604-BLOCK-SMOKE-ALARM-/170658276272?pt=UK_ConsumerElectronics_Batteries_SM&hash=item27bc06a3b0

 

[Three Zeroes]

Procells or No cells.