Salmon

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

In-game examine text: "Some nicely cooked salmon."

It has a Grand Exchange buy limit of 6,000 every four hours, a high alchemy value of 18 gp, and item ID 329.

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Salmon currently has a flip margin of +0 gp, which isn't profitable to flip right now despite 150,654 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.