Insta-buy vs offer at margin
Two ways to fill an order. One trades GP for time, the other trades time for GP. Use both, but use them on purpose.
Insta-buy explained
An insta-buy means you set your buy offer at or above the current selling price. Someone is already selling at that price, so your offer fills immediately. You get the item now, but you pay the higher of the two prices in the spread.
On the GE the insta-buy price is what the in-game tooltip calls the "average sell" or what flipping tools show as "buy at" on item pages.
Offer at margin explained
Offering at margin means placing your buy at or near the lowest current buy price (the insta-sell side). You are below the lowest seller, so your offer does not fill instantly. You wait for someone to insta-sell their item to you, accepting your lower price for the speed.
This is where the actual margin lives. The full spread between insta-sell (your buy) and insta-buy (your sell) is yours to capture, minus tax.
Worked example
Take a Saradomin brew (4) with insta-sell at 8,500 and insta-buy at 9,200.
| Strategy | You buy at | You sell at | Margin per unit |
|---|---|---|---|
| Insta-buy, insta-sell back | 9,200 | 8,500 (you would lose) | negative, do not do this |
| Insta-buy, sell at margin | 9,200 | 9,200 or higher (wait) | 0 to small, depends on movement |
| Buy at margin, sell at margin | 8,500 | 9,200 | ~516 after tax |
| Buy at margin, insta-sell | 8,500 | 8,500 (immediate) | ~0 after tax |
The full margin only exists when you buy at margin AND sell at margin. Either side using insta destroys most of the spread. This is the core flipping move.
When insta-buy makes sense
Insta-buying is wasteful for normal flipping, but there are situations where speed is worth the cost:
- You spotted a temporary spike. The margin opened up because of news or a streamer mention. By the time your offer at margin fills, the spike will be gone. Insta-buy in, ride the spike, sell at the elevated insta-buy price.
- You need the item to use, not flip. Buying gear for PvM, supplies for Slayer. Skip the patience game.
- The item has very low volume and you have a buyer lined up. If you know someone offering at insta-buy will purchase the moment you list, the round trip might still be profitable even at insta-buy entry.
When offer at margin makes sense
For 90% of flips, this is the answer. Specifically:
- The item has decent volume. Above 500 daily volume is usually enough to fill within an hour at the margin price.
- You can wait. Place the offer, walk away, check back later. The 4-hour buy limit window is generous.
- The price is stable. You are not racing a moving market.
Pricing your offer
A common mistake is placing buy offers at exactly the current insta-sell price, then watching them sit forever. The insta-sell price reflects what some seller already accepted. To fill your offer, someone has to be willing to insta-sell to you, which means you usually need to be slightly above the lowest visible offer.
A good rule: place your buy at insta-sell plus 1 GP for low-priced items, plus 0.1% to 0.5% for higher-priced items. You give up a tiny slice of margin in exchange for actually filling.
The hybrid approach
Many experienced flippers use a hybrid: buy at margin (patient), sell at insta-buy minus a fraction (slightly impatient). This sacrifices a small slice of margin on the sell side to fill faster, freeing up GE slots and capital for the next flip.
The math: a 1% sacrifice on the sell side might cost you 100 GP per unit on a 50,000 GP item. If you can run two flips in the time it would take to fill one at full margin, the trade is usually worth it.
See both prices on every item
GE IQ shows both the insta-buy and insta-sell side, with the post-tax margin clearly marked. Pick your entry strategy with full information.
Open GE IQ