Sonoff WiFi Switch, 90Vac to 240Vac, 10 Amp
Cayenne Load-able (Esp8266),-just add headers.
$4.99
Use it as an in-line Wifi switch on an extention cord,
or appliance/light/fan cord.
Simply cut the cord and install where desired in the line,
Power-In Plug on Left,
Power-Out on right.
-you can even access an additional programmable GPIO!
http://www.ebay.com/itm/like/152147180815?lpid=82&chn=ps&ul_noapp=true