Weapon poison(+)

The Weapon poison(+) is a members-only Old School RuneScape item — “A vial of extra strong weapon poison, for spears and daggers.”. Its Grand Exchange buy limit is 2,000 per 4 hours. Right now it buys at 500 gp and sells at 825 gp — a net margin of 309 gp (61.8% ROI) after the 2% Grand Exchange tax of 16 gp. High alchemy yields 172 gp.

To flip it, place a buy offer near 500 gp and a sell offer near 825 gp; the spread minus GE tax is your profit. Confidence figures are model estimates from live OSRS Wiki prices, not guarantees — flip responsibly.