9 Volt Alkaline Energizer® Industrial Batteries, sold in boxes of 12. Order on-line.
Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 4 count : Amazon.ca: Health & Personal Care
DURACELL- CopperTop 9V Alkaline Batteries - Long Lasting, All-Purpose 9 Volt Battery for Household and Business - 1 Count : Amazon.ca: Health & Personal Care
Energizer NH22NBP 1-pk 9V / 9 Volt 175 mAh NiMH Rechargeable Battery, Pre-Charged, All Purpose | Canadian Tire