Say your wireless router can’t push a strong signal to every corner of your house, or maybe you own some kind of old set top box that needs an ethernet connection, but doesn’t live near the router. A simple powerline adapter is one of your best options for extending a home network, and you can get a great one for just $40 today. [TP-Link AV500 Powerline Starter Kit, $40 after clipping the $5 coupon]

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