http://cgi.ebay.com/NEW-Bluetooth-Upgrad...1QQcmdZViewItem

That is made for the iBook 14' but the 12' logic board is essentially exactly the same minus clock speed and battery (I learned that the hard way...) I could imagine unless the port is hardware disabled, it'd be as simple as plugging the module into it, and finding a place to stuff it. (Converting the HD to SSD CF would be an awesome way to free up some space.)

It's scary that some wires and an antenna could cost 65 bucks. Can you say rip off?