1. The item you post MUST be the cheapest (no other items below your price).
2. If there’s someone else’s price below yours, we can’t buy it, because the market is locked to the cheapest items. And there’s no way to buy it directly; you’ll have to buy all the cheaper items first.
3. All items are available, but it depends on their rarity in the auction. I recommend using the blue or purple key, as some KEY items are still in short supply.
4. Use a unique number when posting on AUCTION, such as 14981 or 9967.
5. We didn’t cover tax and any other expanses (including your key spendings), because you need to prepare and lose gold to buy item and make sure your list is cheapest.

Be patient, the transaction process in this game is very disadvantageous to you as a buyer and quite complicated.