Battlestaff

Battlestaff is a members-only item on the OSRS Grand Exchange in the weapons category.

In-game examine text: "It's a slightly magical stick."

It has a Grand Exchange buy limit of 11,000 every four hours, a high alchemy value of 4.2k gp, and item ID 1391.

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Battlestaff shows an active flip setup with a margin of +44 gp and 1,571,128 trades over the last 24 hours.

At the buy limit of 11,000 every four hours, max profit per cycle is about 484.0k gp — high margin with healthy liquidity.