Building products, like many other products, have a lower per-unit cost when purchasing large quantities.  Another factor in the price paid for materials is how many times do they have to be handled.  The more direct, the lower the price.  Fortunately, Economy Garages has the facility and the ability to take advantage of many direct opportunities and large quantity orders, which is a win on both fronts.  We often purchase full trucks of materials like shingles, roofing felt, ice-n-water, rebar, and other products which then get shipped right from the factory, minimizing product handling and maximizing savings.