They are plentiful here in the States and easily found at all the Big Pharmacy's, Office Supplys, Hardware and Home Improvement Centers. Duracel has them if you have a store the has one of those large displays. Since you are in Canada try searching for the batteries under the LR1 which is the same as N.
I also think that the E90 is the same as N size as seen here at Canadian Tire https://www.canadiantire.ca/en/pdp/energ...p.html#srp
According to the Energizer web site there are several numbers associated with an N battery https://www.energizer.com/specialty-batt...8a4d2d7dfc
I also think that the E90 is the same as N size as seen here at Canadian Tire https://www.canadiantire.ca/en/pdp/energ...p.html#srp
According to the Energizer web site there are several numbers associated with an N battery https://www.energizer.com/specialty-batt...8a4d2d7dfc