Wireless speaker info needed

[Donald L. Roberts]

I'm inquiring about info for a typical stereo speaker setup for wireless 
speakers, stated another way, no surround sound.  If one doesn't want to 
serenade the people in the next house or apartment, do wireless speakers 
have sufficient amplification and tone quality to produce good high 
fidelity?  Also, how far can the signal be picked up from the 
transmitter?  Lastly, what kind of money are we talking about in U.S. 
dollars?
Recommendations please!

Don Roberts