USB 802.11b or g network adapter

[Eric Asberry]

Any recommendations for a USB network adapter compatible with OSX, preferably one that could be picked up at a place like Circuit City or Best Buy?  One of my nephews has an older Mac tower that does not have wireless built in.  I guess most USB adapters (Linksys, etc) don't have OSX drivers.  It's older hardware, have no idea what model, but he is running 10.4.8.

Another alternatives would maybe be a low cost wireless bridge... Anybody know of any good ones that can be picked up locally that they would recommend?

Thanks!