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If there are any health food stores nearby, you could check to see if they have food-grade hydrogen peroxide in stock.
If not, they might be able to order it for you. Here in BC, I can get 3% food grade and 17-1/2% food grade at some of the health food stores.
If you want to order it online, here is a Canadian link – Sprout Masters:
https://www.sproutmaster.com/35-food-grade-hydrogen-peroxide-c-1/
Due to Natural Resources Canada regulations, hydrogen peroxide OVER 30% is considered a “chemical of concern” and Sprout Master will need to ask for your driver's license number (do not send a photo of it - they just need the number). If you don't have one, then you need to give your provincial ID number when you check out.
As well, you will be asked what your intended use of the product is.
I use it for many things – growing sprouts (helps prevent mold), sanitizing fruits and vegetables, watering plants (diluted), cleaning around the apartment, as an alternative to bleach in the laundry, etc.
As well, you can buy food-grade 3%, 6% and 12% hydrogen peroxide on Amazon.ca:
https://www.amazon.ca/food-grade-hydrogen-peroxide/s?k=food+grade+hydrogen+peroxide
I hope this helps.
Take care,
Tessa