TP-Link's Kasa smart plugs are some of the most popular around because of how easy to use and affordable they are. A single plug usually sells for upwards of $18, though thanks to a current sale at Amazon, you can pick up this Kasa Smart Plug 4-pack for only $39.99 right now when you clip the coupon on its product page. That's like picking them up for only $10 each, a deal we've never seen offered on the single plug. This set of smart plugs regularly sells for up to $50.

If you're lucky, you may be able to score these smart plugs for as low as $31.49, though that coupon is only available for select accounts.

These tiny smart plugs let you control whether they're powered on or off using a free app on your smartphone or tablet. That means anything plugged in will be turned on and off along with it, so you can start controlling lamps and box fans and more inside your home even when you're not there. The app even lets you schedule when you want one of the plugs to turn on or off, so you can schedule your lights to come on right around the time you get home from work each day for example.

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Kasa smart plugs even feature voice control if you have a compatible device with Amazon Alexa, Google Assistant, or Microsoft Cortana. The Amazon Echo Dot can help you unlock that functionality if you don't own one already.

Shipping at Amazon is free on orders totaling $25 or more, or with an Amazon Prime membership. If you've never been a member before, you can start a free 30-day trial to score free two-day shipping with no order minimum, exclusive members-only discounts, access to the Prime Video streaming service, and more.

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