TP-Link Kasa Smart (KP200) Wi-Fi 2-Outlet In-Wall Smart Plug for $19.99. Shipping is free on orders over $25. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for reference. It is worth noting that at the time of this post, it has received 4.6 out of 5.0 stars after 017 reviews. Most places have it for about $39.