SuzanneG, If you are still buying the regular blades for your rotary cutter you need to try the Harbor Freight 'carpet cutter' blades. They fit the 45 mm cutters. Some really like them (me) and others don't---they seem to have a few more 'duds' than the regular blades, but the last time I bought them they were 2.99 a package for 2. Don't ask for rotary blades if you go to the store, ask for the carpet cutter blades. They are usually in the first row of shelves just behind the registers. I have found they are usually just above eye level on one corner of the shelf units. They are also available on their site. Good luck!