Acorn

The Acorn is a members-only Old School RuneScape item — “Plant this in a plantpot of soil to grow a sapling.”. Its Grand Exchange buy limit is 200 per 4 hours. Right now it buys at 92 gp and sells at 150 gp — a net margin of 55 gp (59.8% ROI) after the 2% Grand Exchange tax of 3 gp. High alchemy yields 3 gp.

To flip it, place a buy offer near 92 gp and a sell offer near 150 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.