Price of copper question.So I have been normally using kitco to look up copper prices over the years. It's only ever a couple minutes delayed and i thought the price was accurate. However I checked out ths site https://tradingeconomics.com/commodity/copper and it appears to show a slightly higher price and showed it at 3.30 at one point today. And someone else i spoke to mentioned they saw it even hire than that earlier today! Does anyone know the best and most accurate way to check the copper prices?