Discovered cave goblin wires when I was going for 91 thieving. At the moment cave goblin wires are worth 2k each and only requires 44 thieving. It also doesn't require a lot of attention as all you need is to click and steal the wires. Cave goblin wires are the best way to train crafting at 87 crafting which is why these are worth 2k or more. The price also goes up to 3k sometimes which can earn you more money. Here's a video I made regarding the money making technique. This is my first video so sorry for the bad editing. Tell me what you think guys.