Personally, I charge in my prices the "hours" labor I think that it will take to cut what is needed. Mostly based on previous numbers/experience. The price of our saw/blades is included in our project overhead. Most of the blades I have bought last about 500-1000 ft. Depending on how many binds my guys put them in. At $200 a blade that is somewhere between $.20-.40 per linear foot cut. It can add up if you are cutting a soldier course on a 50 ft walk, that is 100 ft of cutting, or $20-$40. It adds up, but to itemize it is a little cumbersome. Project overhead is just easier as a % of total bid price for me.