Linksys via eBay offers the refurbished Belkin WeMo Home Automation Switch for iOS and Android for $14.99 with free shipping. That's tied with yesterday's expired mention as the lowest price we've seen. (It's also $12 below the best price we could find for a new unit.) The switch operates over WiFi and mobile Internet to turn electronics on or off from anywhere. It's compatible with smartphones or tablets running Android 4.4 and higher or iOS 9 and higher and works with Amazon's Alexa-enabled devices via voice control.
Note: No warranty info is provided.