we charged 6 bucks a foot for c-9s from 2001 to 2006, and went up to 6.50 a foot in 2007 I believe. we are probably due to go to 7 per foot in 2012. this includes selling and not renting the product the first year, along with all the cords, timers, clips, plugs, labor to install, takedown, and stored at our warehouse. etc. we do 3.25 per foot for labor up and down and store in the years following.
this is more than most folks charge, but I have looked at all the labor and overhead numbers, and I can't do it for less.