London Drugs should carry them. For sure camera stores that still retail 35mm stuff will as well but you're going to get hosed buying batteries from them. You might also get hosed buying from Radio Shack too.
Other places I can think of might be large stores like Wally world and Canadian Superstore that have large battery sections/aisles.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE