Posted for Art Jensen <flycassutts@yahoo.com>:

 John,
  
 You can buy them off of ebay mostly used but on occasion there will be a new
one show up.  With the card in the box before power up it should take you the
the "Ground maintenance" page where you can edit your system limits.  I
believe that all it has to do is recognize that a card is in the slot to go
there.  Probably will get you there even with a bad card.  Be sure to powere
down before removing the card.
  
 Art