I have ordered 3 for £21 carriage paid .

If they work well then great , If they dont then not a lot lost.
The only failure I have ever had was from a well known UK supplier which cost me about £57 inc carriage (about £9) and vat .

Isnt it amazing how the Chinese can provide you with the goods, shipped across the world to your door , cheaper than a local firm charges for P and P