Acorn

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

In-game examine text: "Plant this in a plantpot of soil to grow a sapling."

It has a Grand Exchange buy limit of 200 every four hours, a high alchemy value of 3 gp, and item ID 5312.

View on OSRS Wiki

Acorn shows an active flip setup with a margin of +57 gp and 24,546 trades over the last 24 hours.

At the buy limit of 200 every four hours, max profit per cycle is about 11.4k gp — high margin with healthy liquidity.