I am new contractor and we are doing mostly commercial jobs. I have been doing "O.K." with my bidding so far but would love to get a better handle on my labor cost. I have heard that the PDCA etimating guide volume 2 is pretty good but I don't feel like dropping a couple hundred dollars on a book if I don't have too. Does anyone know of a good resource for that kind of info, a way to get a cheaper copy of that book or if it is worth it?