How to setup a simple wireless audio system?


Looking to setup a simple wireless audio system for an older friend. Want this to enable her to listen to sounds off her pc in another room or internet radio. Had planned on a SBT and now find that they are no longer available? She is 67 and not an audiophile so its more a matter of a way to listen to stuff off her Mac in her bedroom office on the stereo in her living room. Is there something simple out there that i can buy her?
joekapahulu
Another good option is a Sonos system. She can play whatever is in her library any where.