Sea turtle

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

In-game examine text: "Tasty!"

It has a Grand Exchange buy limit of 10,000 every four hours, a high alchemy value of 120 gp, and item ID 397.

View on OSRS Wiki

Sea Turtle shows an active flip setup with a margin of +31 gp and 440,809 trades over the last 24 hours.

At the buy limit of 10,000 every four hours, max profit per cycle is about 310.0k gp — high margin with healthy liquidity.