Harbor freight is where I get my 45mm blades for my rotary cutter...I actually used one to cut linoleum, and then used it on fabric a week later, and there was no difference! And they're cheap too! I had my b/f pick me up 5 packs, with his discount for working there, and the sale, it was all of $6 for 10 blades. Seriously, if you have a HF near you, try them out! Its about 2.79 for 2 blades. Best blades ever IMO.