 Metal roofing lasts three times longer than shingles. So naturally, you would assume it would be quite a bit more expensive as well. Well, that isn't the case. The cost similarities between asphalt shingles and metal roofing are quite similar. However, the benefits of a metal roof far exceed that of a shingle roof. Palmer's Metal Mart manufactures high-quality metal panels for roofs and walls at amazing prices. Since you buy direct from the manufacturer, you save more money. Metal roofing.