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Masons would install mortar on bricks.
Metal roof pricing ranges on what the structure details are (steepness, valleys, penetrations, wall flashings, chimneys, etc.) and what gauge, profile, ventilation and snow retention (if any) is needed or requested.
I would recommend a licenced mason Please don't have a handyperson do it. It will look terrible and may not withstand an siemic even properly.
i would call some of the licenced home builder in your area and ask them who they would recommend/
Phililp