How to flip Extended antifire(2) in OSRS

Flipping Extended antifire(2) on the Old School RuneScape Grand Exchange currently makes about 5 gp profit per item after the 2% GE tax: buy near 180 gp (the instant-sell price) and re-list near 188 gp (the instant-buy price).

• Buy at (instant-sell): 180 gp
• Sell at (instant-buy): 188 gp
• Margin after 2% tax: 5 gp (2.78% ROI)
• Buy limit per 4 hours: 2,000
• 24h volume: 10,737 (very liquid)
• Max profit per limit cycle: 10,000 gp on 360,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 180 gp (the current instant-sell price).
2. Wait for the fill. Extended antifire(2) is very liquid right now, so offers usually fill within minutes to a quarter hour.
3. Re-list at or just below 188 gp (the current instant-buy price).
4. The GE takes 3 gp tax (2%) per item when it sells, leaving 5 gp profit each.
5. Repeat up to the buy limit (2,000 per 4 hours), a full cycle is 10,000 gp on 360,000 gp of capital.

Margins move constantly. Re-check the live Extended antifire(2) numbers and price chart on GrandExchange.com right before committing.