Item level 55 · Stacks to 20 · Prices on every WoW Forever auction house
Potion of Elemental Purging on every WoW Forever auction house, updated hourly. Cheapest right now: 2g 0s 0c on US · PvP · Horde. About 8 sell per day across all markets.
Busiest market
EU · PvP · Horde
Lowest2gold99silver99copperUsually 2gold99silver99copper≈ 8 sold per day