http://www.musiciansfriend.com/product?sku=301012 and
http://www.musiciansfriend.com/product/GHS-Original-Acoustic-Soundhole-Mic?sku=301011

With the first one ... any reason why I can't run that straight to the board.
Also, there are dampers available if you can find one to fit your sound hole. This will prevent feedback but make your guitar look really, really stupid!