KT-KMC via Amazon has 4-Pack KMC Slim Low-Profile Wi-Fi Smart Plug (White, kt-154) on sale for $10.24. Shipping is free w/ Prime or on $35+ orders.

Product Info:

• This smart plug 4-pack covers all your bases to start remote controlling lights, devices and setting scenes across your home
• The free KMC Smart app allows you to automate your connected devices based on conditions like time, sunrise/sunset, weather, device status and more
• Compatible with Alexa & Google Assistant to voice control your smart plugs by saying “Alexa” or “Hey Google”
• Low-profile design doesn't block the other outlet
• UL/ETL Certified. Electrical Ratings: 15A, 125V, 60Hz, 1875W
• KMC smart plugs come with US-based technical support and a lifetime warranty