Amazon offers the TP-Link WiFi Smart Plug for $29.95. That drops to $20.96 in-cart. With free shipping, that's the lowest price we could find by $4, although we saw it for $8 less on Cyber Monday. (For further comparison, we saw it bundled with a security camera for $60 in February.) It can be controlled via a smartphone and features scheduled on/off and away modes, 802.11n wireless, and voice control via the Amazon Echo (sold separately).