How to flip Extended super antifire(3) in OSRS

Flipping Extended super antifire(3) on the Old School RuneScape Grand Exchange currently makes about 317 gp profit per item after the 2% GE tax: buy near 14,678 gp (the instant-sell price) and re-list near 15,301 gp (the instant-buy price).

• Buy at (instant-sell): 14,678 gp
• Sell at (instant-buy): 15,301 gp
• Margin after 2% tax: 317 gp (2.16% ROI)
• Buy limit per 4 hours: 2,000
• 24h volume: 1,062 (liquid)
• Max profit per limit cycle: 634,000 gp on 29,356,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 14,678 gp (the current instant-sell price).
2. Wait for the fill. Extended super antifire(3) is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 15,301 gp (the current instant-buy price).
4. The GE takes 306 gp tax (2%) per item when it sells, leaving 317 gp profit each.
5. Repeat up to the buy limit (2,000 per 4 hours), a full cycle is 634,000 gp on 29,356,000 gp of capital.

Margins move constantly. Re-check the live Extended super antifire(3) numbers and price chart on GrandExchange.com right before committing.