Take whiteberry in runescape
Requirements: You should have finished mourning’s end part 1.
Method:Use teleport crystal((which you can get from the quest) to transfer to Lletya. You will find whiteberry around that city. And the respawn is very quick, about 5 seconds. Your bad will be full about 2 mins. Every whiteberry worth 1K. So that you can earn more than 300K GP per hour.