Black knife

The Black knife is a members-only Old School RuneScape item — “A finely balanced throwing knife.”. Its Grand Exchange buy limit is 7,000 per 4 hours. Right now it buys at 37 gp and sells at 40 gp — a net margin of 3 gp (8.1% ROI) after the 2% Grand Exchange tax. High alchemy yields 11 gp.

To flip it, place a buy offer near 37 gp and a sell offer near 40 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.