This stuff is pretty close to what Englander uses and is quite reasonable. Size-wise it's enough for two replacement cycles on your NC30. It cuts easily with a serrated knife or a fine hacksaw blade. (Don't breathe the dust) I am using it in my Kent stove.
(broken link removed to http://www.ebay.com/itm/High-density-ceramic-fiber-board-2300-F-900-mm-x-600-mm-x-12-5-mm-1-2-/120995253169)
Has anyone actually used this as a baffle replacement? I just took the baffle out of my DW2500x02 insert because of warping and a hole. I am looking at either using this stuff on ebay ($75) or purchasing a new assembly made heavy gauge steel($250). I submitted a question to the seller about using the fiberboard as a baffle. He indicated that it would work great but you need to be careful when loading wood since it is able to be cut with a utility knife. Does anyone think it is worth trying and risking $75 or just ordering a new assembly? Thanks for any help.