when I went to the supply house to buy several 2 pole 100amp CutlerHammer breakers and Siemens breakers for a project, it was *cheaper* for me to buy entire panelboards with the 100 amp main breaker installed. Why can't they pluck breakers off the line and take advantage of less cardboard, less weight, less metal and less shipping and pass on the savings? In this day and age of emphasis on the 3 R's, and being less wasteful, I was quite surprised.