Amazon currently has these WiFi smart plugs on Lightning Deal with a coupon for an additional 10% off making them $12.16 for one or $22.74 for a two pack.
These are still a good deal even with just the 10% off at $16.20 or two for $31.50. They are the only rectangular horizontal smart plugs that fit two in a receptacle I have found with energy monitoring. They also are rated at 16A instead of 10A so are good for larger appliances. Uses the Tuya/Smartlife app that works with Amazon Alexa, Google Home and IFTTT. I was going to get one to test but this deal made it a gonga.
Single $12.16/$16.20 [amazon.com]
Two pack $22.74/$31.50 [amazon.com]