Wire
noun, の adjective
A needle made of gold is a wire. Perhaps wires were made from gold mostly back in the day? And they were thin like needles? That's my guess.
はりがね
The reading is the kun'yomi reading of both. You've learned 針 already, but 金 is more like お金, rendaku'd.
もし値ごろ感が重視されるのなら、我々の針金が圧勝することになるだろう。
If affordability is a necessity, our wires will win hands down.