This is a WIKI list of all the outlets, plugs, relays, sensors, and IR blasters that are IoT ready, especially if they are proven to work with Node-RED with minimal hacking. Bonus points for smart plugs that include power monitoring. If you can verify any of the below information, or add additional hardware, then please edit this post.
Power Monitoring: YES
Node-RED workflow: VERIFIED
$32 from Amazon.com
Teardown: Teardown of EdiMax Smart Plug SP-2101W (US Version)
Atmel Wifi and Bluetooth ATSmartplug
WiFi, Bluetooth & Power Monitoring
Node-RED workflow: unverified