Pineapple

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

In-game examine text: "It can be cut up into something more manageable with a knife."

It has a Grand Exchange buy limit of 13,000 every four hours, a high alchemy value of 1 gp, and item ID 2114.

View on OSRS Wiki

Pineapple shows an active flip setup with a margin of +24 gp and 209,351 trades over the last 24 hours.

At the buy limit of 13,000 every four hours, max profit per cycle is about 312.0k gp — high margin with healthy liquidity.