Quick "N" Easy (P2P)

Two words my friends... Snape Grass. Atm, the market price is 436 for 1 snape grass. You can get snape grass from picking it off the ground via going to Waterbirth island. To get to Waterbirth island you must teleport to Camelot, walk north, cross the bridge, and take the boat that is on the far west. Back to the snape grass; you can easily pick up the object and get a full inventory of snape grass within 30-60 seconds. They respond fast and there are 4 snape grass on each side of the boat. If snape grass is 436 each and you get a full inventory that is already 12,208gp made in less than a minute. After you get a full inventory travel back on the boat and deposit your snape grass to Seer the Peer...(You must have on Fremminik Sea Boats on to deposit) so if you get 1k of snape grass that is 436,000gp made in about 30 minutes. So you can make around 872k an hour! Hope I helped!

NOTE: Watch out for lvl 13 rock crabs if your a low lvl. They won't attack you unless you go up to them though!