How to flip Large dragon keel parts in OSRS

Flipping Large dragon keel parts on the Old School RuneScape Grand Exchange currently makes about -400 gp profit per item after the 2% GE tax: buy near 510,000 gp (the instant-sell price) and re-list near 520,000 gp (the instant-buy price).

• Buy at (instant-sell): 510,000 gp
• Sell at (instant-buy): 520,000 gp
• Margin after 2% tax: -400 gp (-0.08% ROI)
• Buy limit per 4 hours: 100
• 24h volume: 826 (moderately traded)
• Max profit per limit cycle: -40,000 gp on 51,000,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 510,000 gp (the current instant-sell price).
2. Wait for the fill. Large dragon keel parts is moderately traded right now, so fills can take an hour or more, patience pays here.
3. Re-list at or just below 520,000 gp (the current instant-buy price).
4. The GE takes 10,400 gp tax (2%) per item when it sells, leaving -400 gp profit each.
5. Repeat up to the buy limit (100 per 4 hours), a full cycle is -40,000 gp on 51,000,000 gp of capital.

Margins move constantly. Re-check the live Large dragon keel parts numbers and price chart on GrandExchange.com right before committing.