How to flip Inquisitor's great helm in OSRS

Flipping Inquisitor's great helm on the Old School RuneScape Grand Exchange currently makes about 416,006 gp profit per item after the 2% GE tax: buy near 142,600,000 gp (the instant-sell price) and re-list near 145,934,699 gp (the instant-buy price).

• Buy at (instant-sell): 142,600,000 gp
• Sell at (instant-buy): 145,934,699 gp
• Margin after 2% tax: 416,006 gp (0.29% ROI)
• Buy limit per 4 hours: 8
• 24h volume: 486 (moderately traded)
• Max profit per limit cycle: 3,328,048 gp on 1,140,800,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 142,600,000 gp (the current instant-sell price).
2. Wait for the fill. Inquisitor's great helm is moderately traded right now, so fills can take an hour or more, patience pays here.
3. Re-list at or just below 145,934,699 gp (the current instant-buy price).
4. The GE takes 2,918,693 gp tax (2%) per item when it sells, leaving 416,006 gp profit each.
5. Repeat up to the buy limit (8 per 4 hours), a full cycle is 3,328,048 gp on 1,140,800,000 gp of capital.

Margins move constantly. Re-check the live Inquisitor's great helm numbers and price chart on GrandExchange.com right before committing.