Amazon is offering the TP-Link HS105 Mini Smart Plug w/ Alexa support for $13.99 plus free Amazon Prime shipping (free shipping for regular orders over $25). Originally priced at $30, this is the best price we could find on a smart plug that allows you to control it with your voice.
This is the older model of the smart plug, Amazon is also offering the newer model on sale, plus a 3-pack:
The TP-Link Smart Plug Mini is everything we’ve come to know, love and expect in a smart outlet and them some. Allowing for remote control of plugged in devices, scheduling, voice control and more, this outlet will let you have true and total control over all the electric products in your life, smart or not.
What makes this outlet really special though is its size. Most smart outlets are bulky and take up an entire standard outlet, meaning you can only plug one thing in at a time. But with the TP-Link Mini you can finally have both your outlets back again! That means you not only experience total control, you also experience extra control as well.