Box trap

The Box trap is a members-only Old School RuneScape item — “If a creature goes inside, the box should then slam shut.”. Its Grand Exchange buy limit is 250 per 4 hours. Right now it buys at 35 gp and sells at 40 gp — a net margin of 5 gp (14.3% ROI) after the 2% Grand Exchange tax. High alchemy yields 19 gp.

To flip it, place a buy offer near 35 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.