My point in posting that article was more about highlighting the pitfalls off buying fake stuff , especially where you rationalise about the origin (oh, it all comes from the same factory). I could have posted an article about fake USB memory. That's a popular one. The root is rewritten to make it show as a bigger size. So instead of say a 512gb memory stick, what you are actually getting is a 64gb rewritten to look like a 512. Your computer will show it as 512, but once it gets close to 64gb full you'll get an error message or disk is full message.
Definitely don't buy USB sticks from eBay or Ali express 😉
Skippy, your links a good case in point. Get the cheaper CO detector, but from Quell or wherever, not from eBay or Ali express.
Reputable suppliers have to submit their products for testing. That goes for USB chargers, clothes irons, lawn mowers or whatever. If you bypass that by going overseas, you don't know what you're getting. If it's failure is not dangerous (my fake tv remote for instance) it might be worth a gamble.