Is Metal Roofing Cheaper Then Shingles?

I would like to know if metal roofing is more affordable then shingles. I know metal roofing is louder when it rains but if I can save a few grand so what. Is it worth the switch? My house was built in ’92 and my shingles are already curled up from the heat. I don’t even live in the south where it gets really hot.