You can get exposed fastener metal (5v-crimp) in galvalume (no paint) for nearly the same price as shingle.
Some roofers might be charging more for shingles at this point.


If you do exposed fasteners beachside, pay attention to materials,
and might have to replace fasteners 10 years down the road anyway.

You can do aluminum if you have the $.

I did a lot of roofer shopping, best estimates for my 2,000 ft2 hip roof with gable ends was 7k for shingle and 9.5k for 5v crimp.

I'm going to install standing seam metal myself, no exposed fasteners, <7k in materials.