Here I am, a Canadian, and all along I thought that retailers could legally compare with List Prices. I already took that into account when contemplating amazon.ca purchases. My impression remains that some outlets (Brits might call them High Street shops) actually do charge List Price, in general, but of course most shopping is done at big- or medium- box retailers (how can I give this the right flavour?) such as Canadian Tire. Notice flavour but not tyre; mouse has strange bedfellows.
It's apples vs oranges comparing retail with utility. Were I a commission, I'd come down smartly on utility price misdirection. And I'd also have fined a whole raft of businesses (and gov't operations) here on retail practices before fining amazon.ca. I suppose it's not fair to give only a partial list. And nobody is talking about employee practices here, that is another topic.
amazon.ca customers have pretty easy access to amazon.com customer reviews, but I've found that amazon.co.uk comments are often more thoughtful, even if it takes a few extra clicks to find the exact same item. I've even purchased from amazon.co.uk, though not recently, on small items, being extra careful that they are fit for purpose on this side of the pond. Hint: if they plug into the wall, they probably aren't.