Dagannoth bones

Dagannoth Bones is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "These would feed a dogfish for months!"

It has a Grand Exchange buy limit of 7,500 every four hours, a high alchemy value of 90 gp, and item ID 6729.

View on OSRS Wiki

Dagannoth Bones shows an active flip setup with a margin of +87 gp and 82,818 trades over the last 24 hours.

At the buy limit of 7,500 every four hours, max profit per cycle is about 652.5k gp — high margin with healthy liquidity.