Item level 1 · Stacks to 20 · Prices on every WoW Forever auction house
King's Square Postbox Key on every WoW Forever auction house, updated hourly. Cheapest right now: 44s 0c on US · Normal · Alliance. About 1 sell per day across all markets.
Busiest market
EU · PvP · Alliance
Lowest1gold99silver98copperUsually 96silver99copper≈ 1 sold per day