Linksys via eBay offers the refurbished Belkin WeMo WiFi-Enabled Light Switch for $14.99 with free shipping. That's tied with our expired mention from earlier today and $33 under the lowest price we could find for a new one. (For further comparison, we saw it new for $14 more on Black Friday.) The WeMo allows you to control your lights from anywhere with a wireless or mobile Internet connection via smartphone or tablet. It's compatible with Google Home, Amazon Alexa, and Nest Thermostat.
Note: No warranty information is provided.