Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
Have you been watching the news?
Unemployment is expected to rise to between 7-9%. Just about every company in the CE industry (not to mention most other industries...retail, manufacturing, financial, transportation) is slashing their earnings projections for next year.
And the GDP of the US economy alone is measured in $T these days...so if smartphone and HDTV sales actually dropped below $M, and bottled water dropped below $B, the global economy would essentially stop.
Your theory is very "economical", indeed...it cost nothing, because its worth nothing.