If you missed out on getting a 3-pack of TP-Link smart plugs for $30 last week, but are looking to get started with smartening up your home, you're in luck: TP-Link has a 4-pack of smart plugs for $24 right now on Amazon with a coupon code. But if you've already got an existing TP-Link setup, you'll want to keep in mind one major catch.

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