If you're looking for multi-room audio on a budget, check out this system reviewed by Chris Martens:
In today's electronics world Multi room audio video it's a hi-fi
smart home technology. The electronics that provide the surround sound can be housed in beautiful custom-made furniture. Even the plasma TV, or projector and screen, can be hidden out of sight and revealed at the push of a button.
CEO and Editorial Director, Nextscreen LLC
The easiest way is to network your house and use ethernet connectors to add media or audio extenders. These can grab teh music off a centrally located media server. Perhaps not for $380 tho...
But once the network is in place, adding an extender can be significantly less than $380