It is amazing that we will spend up to $12/yd for fabric with hardly batting an eye and then put the brakes on when it comes to replacing a rotary blade. Most of us probably live near a Joann's where they have at least a 40% off coupon weekly that we can use on a blade and if you can afford to get a five pack - much better for you than a six pack!
In fact Joanns has a 5 pack of 45 mm blades on sales this week for I believe $16.99 and it is also Military appreciation and if you have Military ID you get an additonal 20% off of regular and sale priced items!