The whole machine can be replaced for $50-$75 and that is what I will probably do unless I can swing a good deal on a used Airport Card. They are no longer available new from Apple, I'm not sure that an aftermarket card is available.
eBay and they are not cheap. <http://search.ebay.com/apple-airport-card_W0QQfromZR40QQfsooZ1QQfsopZ1QQssPageNameZWLRS>
Better to buy another machine if you can get one for less than one of these cards...
Rick Knoble '85 300 CD '87 190 DT
