Lockpick

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

In-game examine text: "For picking tough locks."

It has a Grand Exchange buy limit of 250 every four hours, a high alchemy value of 12 gp, and item ID 1523.

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Lockpick shows an active flip setup with a margin of +42 gp and 41,066 trades over the last 24 hours.

At the buy limit of 250 every four hours, max profit per cycle is about 10.5k gp — high margin with healthy liquidity.