B&H Photo Video offers the Keewifi Kisslink WiFi Smart Plug Mini for $19.99. Clip the 25% off coupon on the product page to cut the price to $14.95. With free shipping, that's the lowest price we could find by $5. (For further comparison, we saw a 2-pack for $30 in September.) Via the free Kisslink app, this plug allows you to turn devices on and off remotely and set customized schedules. It also features voice control via Amazon's Alexa.