In response to DebbieC (reply#32), there are rotary blades at Harbor Freight and they are used for cutting carpet, etc. I did try the HF blades but they did not work well. For example, there were areas where the cutter did not work at all and I had to go back and cut again. I had another concern...those blades may not be good for the rotary cutting mats. I do not use the generic cutting mats from Joann's, especially the large 36 by 59/60 inches. I learned the hard way the rotary cutting blades have to be replaced more often. It's better to stay with the name brands. Hope this helps.