I’ve had good luck with various items, largely from Aliexpress, I can’t really talk about which one could be the safest, so to speak.
Advice to keep an eye on: things are likely to be exactly what they describe it to be. And I do mean exactly. Say you get a AA battery charger, when you get one from your corner store, you’ll expect it to charge the batteries in a timely manner. From Ali, the charger might take 12+ hours to do its job or maybe overcharge it. Or it’ll work perfectly.
So, only get the ultra cheap stuff from these sites if you don’t really care about it.