Bones

Bones is a free-to-play item on the OSRS Grand Exchange in the other category.

In-game examine text: "Bones are for burying!"

It has a Grand Exchange buy limit of 3,000 every four hours, a high alchemy value of 1 gp, and item ID 526.

View on OSRS Wiki

Bones shows an active flip setup with a margin of +3 gp and 201,021 trades over the last 24 hours.

At the buy limit of 3,000 every four hours, max profit per cycle is about 9.0k gp — high margin with healthy liquidity.