There are a few factors we don't know. Are you doing the roof or hiring someone? How big is the roof? Dimensions?
$2.00 ln foot is a good price. I once found $1.50 ln foot at a local tractor supply place. You can even find it as low as 2.65 ln foot on line at www.polebarnsonline.com
. I'm a numbers guy so lets break down the numbers. I will use the figures from the pole barn site as an example. I will use Lowes for the asphalt shingle example, because the prices are usually pretty standard across all big box stores and areas, and they are online. The last I checked they were 18.75 a pack that covered 33 square feet. The metal roof cost $44.64 per sheet and covered 48 square feet.
So if you have a hypothetical roof of 800 square ft. The shingle roof would cost approximately $455 and the metal roof $744. This is just the material and not the felt paper, fasteners, shipping, etc. Yes the metal roof would cost 65% more, but it is only $270 for the 30 year warranty and far superior product. You can also extend the life of a metal roof by maintaining it and painting it. Also once it goes, you can recycle it instead of paying for the dump. Almost 20% of the yearly landfill in this country is from construction waste, most of that being asphalt shingles.
My dream would be to put a copper roof on. With a good patina for protection it can last a hundred years, but knowing my luck I would go away for a weekend and come back to no roof on my house.