Another option is to RuneScape gold extract the rune vital in varrock. To do this, you'll need the quest Rune Mysteries. There is an ATM right next to the shop selling runes which allows you to be transported. It is possible to sell rune essence or create rune, and later sell it.
This is one of my favorites. Go to the barbarien village, then descend the hole entrance to reach the final level. Kill ankou's to get rune essence as well as coins. Get exp for this. (The ankous can bring food and are lvl 75). If you have any queries, please ask them. If you're not sure about something, inform me. Be sure you let me know if you have any money making tips. hope i helped u make some money.