Herb running is a source of income for low-levels. It involves killing Chaos druids for their herbs and banking after a full load. This tactic can make over 100k-200k a trip. If you are keeping all the higher herbs, herb gloves from Fist of Guthix minigame (especially the higher levelled ones, such as Kwuarm gloves) can greatly increase your profits. Even though all the expensive herbs are (uncommon) drops from Chaos Druids, it is notable that Ranarrs tend to drop more frequently than the other expensive herbs.