How to flip Tumeken's shadow (uncharged) in OSRS

Flipping Tumeken's shadow (uncharged) on the Old School RuneScape Grand Exchange currently makes about -47,760 gp profit per item after the 2% GE tax: buy near 670,047,760 gp (the instant-sell price) and re-list near 675,000,000 gp (the instant-buy price).

• Buy at (instant-sell): 670,047,760 gp
• Sell at (instant-buy): 675,000,000 gp
• Margin after 2% tax: -47,760 gp (-0.01% ROI)
• Buy limit per 4 hours: 8
• 24h volume: 943 (moderately traded)
• Max profit per limit cycle: -382,080 gp on 5,360,382,080 gp of capital

The flip, step by step

1. Place a buy offer at or just above 670,047,760 gp (the current instant-sell price).
2. Wait for the fill. Tumeken's shadow (uncharged) is moderately traded right now, so fills can take an hour or more, patience pays here.
3. Re-list at or just below 675,000,000 gp (the current instant-buy price).
4. The GE takes 5,000,000 gp tax (2%) per item when it sells, leaving -47,760 gp profit each.
5. Repeat up to the buy limit (8 per 4 hours), a full cycle is -382,080 gp on 5,360,382,080 gp of capital.

Margins move constantly. Re-check the live Tumeken's shadow (uncharged) numbers and price chart on GrandExchange.com right before committing.