Dell offers three TP-Link WiFi Smart Plugs, model no. HS100, for $69.99 with free shipping. That's $23.33 per plug and the lowest total price we could find for this quantity by $5. (However, we saw a 2-pack for $40 shipped in July.) 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).