> On Alibaba, 50 cents. > On Amazon, maybe 1.5 USD. There's a decent chance neither of these pass the minimum safety requirements. It would be fairer to comp

> On Alibaba, 50 cents. > On Amazon, maybe 1.5 USD. There's a decent chance neither of these pass the minimum safety requirements. It would be fairer to compare with a socket adapter from a supermarket. e.g. Tesco, £4.50 for two, vs. Heathrow Airport £11 for two.