The Message spell requires a short piece of copper wire to cast. Suppose you do not have access to a spell component pouch. Where might copper wire exist? And how might it be used outside of spellcasting?
Edit: In response to the comments below:
My character is on an island far from civilization. I just gained level 3 rogue and chose Arcane Trickster. I have no spell component pouch. So, when choosing cantrips, those without material components topped my list. Next, I was looking at those with components that would be easy to find.
My DM questioned why the message spell even had copper wire as a component, and decided that in his campaign, copper wire is not a thing. He replaced it with a material component that made more sense for his campaign.
But it got me wondering, where would you find it in a normal campaign? From what I know of copper wire, it is used for electrical wires. I am not aware of electrical wires in many DnD settings, so I assume the component would have other uses. If copper wire were not a thing, why would a spellcaster ever hold onto it in the first place to discover it was a material component? I suppose I was hoping for some sort of explanation from the designers about how they chose material components, or perhaps where they suspected material components could be found.
It is actually a moot point for my current character's situation, since the DM already removed the copper wire as a material component. I was asking about a normal campaign where copper wire is the required component for the Message spell. It is not really a problem I was trying to solve, but more of a curiosity.
From the comments, it appears this is entirely opinion-based, and there is no source for where to find components. DMs must come up with that. Since that is the answer, I am satisfied, and this question can be closed or deleted.