Belkin's WeMo line of smart plugs at least until today. The WeMo Mini smart plug is only $ 19 today only (normally $ 30).
What's great about the WeMo platform is that it has a wide range of supported devices. It works with Alexa, Google Assistant, IFTTT, Nest, SmartThings, HomeKit (with the WeMo Bridge add-on) and more.
The WeMo Mini comes with all the essential features that you would want in a smart plug
Unfortunately, the plug does not come with energy monitoring, so you've got to step up to the WeMo Insight ($ 40) to get that feature on a WeMo product. Still, though, $ 1
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