That's certainly a possibility. Perhaps you can get a friend in the US to order and ship it to you. Postage should be next to nothing, as the cable is lightweight and can be placed in a small package.
Try just going to https://www.roku.com. It will likely redirect you to the Canadian web site, and then look at the menus across the top and look for Shop Products, and then Accessories in the drop down list. On that page there should be a link to Stick accessories. This is all assuming the Canadian site is laid out the same as the US site.
Dan
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