Saw this and thought it was a decent deal for a 2 outlet model that works with Alexa. These are located in the hardware section near electrical items (outlets, lights, etc) As with all Walmart deals, your mileage may vary (though this deal seems to be universal at all locations).
ECO Outdoor wi-fi plug link to Walmart.com item [walmart.com]
Brickseek link [brickseek.com]
$15 price was in Colorado Springs, CO.
EDIT: Link to Android app [google.com]
EDIT3: Ok, found it on walmart.com and posted link above.
Store Locator [walmart.com]