You'll quickly find that the price differences mostly reflect some combination of various laws and taxes. E.g., I recall reading (pre-Brexit) that UK law required shops to have a two-year warranty period for durable items sold. As in, you bought it from them, you could return it to them and get a new item. Or make them deal with the warranty. In the US, almost anything other than dead-on-arrival can (doesn't always, but can) require the consumer to ship it in the original packaging to the manufacturer's service center at their own cost. That is not a free service. And there may be tariffs involved.
You'll quickly find that the price differences mostly reflect some combination of various laws and taxes. E.g., I recall reading (pre-Brexit) that UK law required shops to have a two-year warranty period for durable items sold. As in, you bought it from them, you could return it to them and get a new item. Or make them deal with the warranty. In the US, almost anything other than dead-on-arrival can (doesn't always, but can) require the consumer to ship it in the original packaging to the manufacturer's service center at their own cost. That is not a free service. And there may be tariffs involved.