How to flip Mage's book in OSRS

Flipping Mage's book on the Old School RuneScape Grand Exchange currently makes about 21,428 gp profit per item after the 2% GE tax: buy near 2,793,043 gp (the instant-sell price) and re-list near 2,871,909 gp (the instant-buy price).

• Buy at (instant-sell): 2,793,043 gp
• Sell at (instant-buy): 2,871,909 gp
• Margin after 2% tax: 21,428 gp (0.77% ROI)
• Buy limit per 4 hours: 15
• 24h volume: 898 (moderately traded)
• Max profit per limit cycle: 321,420 gp on 41,895,645 gp of capital

The flip, step by step

1. Place a buy offer at or just above 2,793,043 gp (the current instant-sell price).
2. Wait for the fill. Mage's book is moderately traded right now, so fills can take an hour or more, patience pays here.
3. Re-list at or just below 2,871,909 gp (the current instant-buy price).
4. The GE takes 57,438 gp tax (2%) per item when it sells, leaving 21,428 gp profit each.
5. Repeat up to the buy limit (15 per 4 hours), a full cycle is 321,420 gp on 41,895,645 gp of capital.

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