Deadlock: Items needed to upgrade furnace need upgraded furnace to be crafted

As of now, following items are needed to upgrade Forge to Atomic Furnace (wiki is outdated on this):

I bought the battery at Infinity Express, however they do not sell copper wire.

So I'm pretty stuck right now. What can I do? I found few copper wires in my chest, but I don't know where they're from and if I accumulated 15 over whole gameplay, I doubt I can quickly get another ten...