OH!!!! I don't know what the model # is! ;-)
DC-200 series. 12". The company gives demonstrators a 50% discount when you call them.
www.everafterarts.com. I also ordered an extra cutting blade which I haven't changed yet, and it's been over a year and I use it a lot. I have had to change the mats. It's a 12" strip, 1/2" wide. I cut from the top (line cs at top of cutter), then at the bottom, then flip the mat around, then flip it over and do it all over again. You'll see a "wide" groove in the mat, and you'll know when to change it. I've only replaced the mat once (using both sides, top and bottom and flipping it around).