Rune Runners
Thank you to Beanraider9 for this tip!
The rune running business is similar to the get it and sell it guide. Any one can do this tip, member or not.
Requirements:
25 rune essence
Know location of the air temple (the guide will tell you where it is anyway, though)
Air talisman or tiara
Must be in world 16 for this tip
Location of the air temple
The air temple is near Falador. Go to the southern entrance and head south west. There may also be some people there. If you have an air tiara on, just left click on the mysterious ruins and go in. If you just have a talisman, use it with the mysterious ruins.
When you go in there, people might be saying open. If they are, trade with them. They may also just be standing there waiting. One think you could try to do is trade until some one is buying. Sometimes, saying ‘selling essence’ works, but not in get it and sell it. Put up the 25 rune essence in the trade window (after they agree to trade with you) and they will put up 2k (2,000gp) and 25 noted rune essence. Now, you can take this back to the bank and redeem the new essence and store your money, or keep it with you, if you please.