How to flip Huasca potion (unf) in OSRS

Flipping Huasca potion (unf) on the Old School RuneScape Grand Exchange currently makes about 91 gp profit per item after the 2% GE tax: buy near 7,262 gp (the instant-sell price) and re-list near 7,503 gp (the instant-buy price).

• Buy at (instant-sell): 7,262 gp
• Sell at (instant-buy): 7,503 gp
• Margin after 2% tax: 91 gp (1.25% ROI)
• Buy limit per 4 hours: 10,000
• 24h volume: 33,620 (very liquid)
• Max profit per limit cycle: 910,000 gp on 72,620,000 gp of capital

The flip, step by step

1. Place a buy offer at or just above 7,262 gp (the current instant-sell price).
2. Wait for the fill. Huasca potion (unf) is very liquid right now, so offers usually fill within minutes to a quarter hour.
3. Re-list at or just below 7,503 gp (the current instant-buy price).
4. The GE takes 150 gp tax (2%) per item when it sells, leaving 91 gp profit each.
5. Repeat up to the buy limit (10,000 per 4 hours), a full cycle is 910,000 gp on 72,620,000 gp of capital.

Margins move constantly. Re-check the live Huasca potion (unf) numbers and price chart on GrandExchange.com right before committing.