Linksys via eBay offers the refurbished Belkin Wemo Mini Smart Plug in White for $19.99 with free shipping. That's $10 under last month's mention of a new one and $15 less than the best price we could find for a new unit today. (It's also an all-time low for this model, in any condition.) It works with Nest devices, IFTTT protocols, and Amazon Alexa, and is compatible with iOS or Android devices.

Note: No warranty information is provided.