What kind of store would sell metal rails?

i'm looking for a store that would sell several foot long copper rails. something maybe 1/2 an inch thick, an inch wide, and maybe 2-4 feet long. what kind of store would sell that? i'm also looking for some metal plates (these can be steel, aluminum, or anything really) about 4 feet by 4 feet also half an... show more i'm looking for a store that would sell several foot long copper rails. something maybe 1/2 an inch thick, an inch wide, and maybe 2-4 feet long. what kind of store would sell that? i'm also looking for some metal plates (these can be steel, aluminum, or anything really) about 4 feet by 4 feet also half an inch thick. although those aren't nearly as important as the copper rails. i'm hoping to use them to connect some huge capacitors and I want to use the metal plates to cut and make a frame for something i'm making.
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