This TP-Link WiFi Smart Plug Lite 2-Pack drops to $14.99 at Amazon. Shipping is free over $25, with a Prime account, or with a free Prime trial. Otherwise, it adds about $5. These devices connect to your home WiFi network, and you can turn them on and off using a smartphone or an Amazon Alexa voice-controlled device.
https://www.amazon.com/TP-LINK-HS…p;amp;th=1