sorry to burst all your bubbles, but as a current comcast employee, (installer) you will be charged 28.00 for the first additional line to be run, and 17.75 for the second to be run, as this will be a change of service, not your origional install, since you are a current customer. These are prices charged by comcast (accurate to my area, not 100% if they are national, but i would assume so) not by your installer whether he be a contractor or inhouse. we dont get paid to run the line if we dont have comcast bill you for it, and no we cant not mark down we ran two lines as then the work order would not be completed and we wouldnt be paid to do the job at all. Whether a tech would accept a 'tip' to run the lines and cancel the job to not bill you is up to the tech, as we could get in serious trouble doing that. I know none of this helps, or is good news, but you have the right to know.