Amazon has Kasa Smart Plugs on sale.
These smart plugs connect into your home wifi. Then you control it with the free Kasa app or by voice control using Alexa, Google Assistant, or Microsoft Cortana.
Here are the top smart plug deals today at Amazon; prices are subject to change:
Below are introductory videos from the smart plug maker, Kasa TP-Link.
Below is an instructional video from TP-Link on how to set up the plug.