I too had a dull blade but read in here somewhere to buy new ones at Harbor Freight. Was at Joanns and looking at new blades. My friend was with me and we both commented on the cost of one new blade! To our surprise a guy (quilter) spoke up and said we could do better at Harbor Freight..DH and I went and after much looking around they were found in the carpet tool section. They are rotary carpet cutting blades,two in a package, for about 3 dollars..They work fine too.!Just saying...a dollar saved is a dollar more to spend on more stash...