everything is included in the 6.50 price- plugs, ext. cords, timers, clips, labor, c-9 cord, bulbs, etc. I measure the roofline edge for linear feet using a wheel , and I have gotten pretty good over the years at using the wheel to figure peaks and cutbacks. tha average home will have 150-250 feet of c-9s. so we charge 150-250 times 6.50 per foot. I don't keep up with how many clips, cords, plugs we use. we just go with it because the numbers work and it is too much of a nightmare to keep up with all the small details. I know folks that line item clips, plugs and cords and timers, but I don't have time to write it out.