Onion

The Onion is a free-to-play Old School RuneScape item — “A strong smelling onion.”. Its Grand Exchange buy limit is 13,000 per 4 hours. Right now it buys at 23 gp and sells at 24 gp — a net margin of 1 gp (4.3% ROI) after the 2% Grand Exchange tax. High alchemy yields 1 gp.

To flip it, place a buy offer near 23 gp and a sell offer near 24 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.