I am in the process of looking for a ceramic fiberboard baffle replacement for my NC30. My 4100i also uses the same material for a baffle. I found a website where it is sold in cartons of 12 pieces, each piece is 24" by 36" and it is 1/2" thick. It should be enough for 2 replacement cycles for the NC30. It appears as though you have to order them by the carton but I am looking into that now. I wanted to see if there was any interest on here if I were to buy a carton. It looks like I could get it shipped to you for around $30-40 a piece. On ebay they are $69. Let me know. I will update with more details, time frame, actual cost, etc if there is interest. Thanks a lot.