Cactus spine

Cactus Spine is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "Don't prick yourself with this."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 1 gp, and item ID 6016.

View on OSRS Wiki

Cactus Spine shows an active flip setup with a margin of +49 gp and 360,151 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 539.0k gp — high margin with healthy liquidity.