Smartplug/SmartRelay with STATE support

Hello,

Can somebody give me commodity brands what I can easily buy on ebay for couple of bucks which can do this?

There are many RF controllable relays and smartplugs but the problem with them that most of these units are dumb receivers, they are unable to signal back their state. I looking for those which can also be queried any time about their state (ON/OFF) and easily manageable by the RFCOMM library and usable with the 350Mhz radio transmitter which comes to the arduino.

Also European plugs only!

Thank you.