I have to give a shout-out to Pictorem – a Canadian on-demand photo printing company. Although located in Canada, their products are delivered for free in the USA and Canada. In addition, photographers can establish an account and sell their art online. All you need to know is at: https://www.pictorem.com/
My photograph of Turret Arch in Arches National Park, Utah was printed by Pictorem on metal with outstanding results.