Smart LED Bulb (Alexa, Google, IFTTT) Multiple Colours
You can get this Smart LED Bulb (Alexa, Google, IFTTT) Multiple Colours reduced from £15.99 to just £7.99 with Prime delivery.
Use the discount code at checkout.
This makes it 50% cheaper.
You can see the discount makes it cheaper than the alternatives:
And here is a price history graph: