£18 voucher brings price down from £38.99 to £23.99 for four, or £6 each. Bought these last time they were on sale, and they work really well, nice and small too compared with some other smart plugs I have.

When mine arrived, I had a card offering a free additional plug if I left an Amazon review, but when I enquired, its actually two free plugs, and so I effectively got 6 for this price last time, making this a stonkin reasonable price, if you are willing to go to the hassle. I left a positive review, but I genuinely think these are very reasonable quality devices for the price. Only bonus would be energy consumption stats I suppose, but otherwise these are as good as you could want.

Specification:

Model: PU13
Color: White
Wi-Fi Requirement: 2.4GHz
Input Voltage: AC 250V
Maximum Outpu: 13A
Compatibility: iOS,Android
Product Weight: 95g.