About the prices
Forever Goblin shows auction house prices for WoW Forever. The data comes from the official Blizzard API, which publishes a snapshot of every auction house about once an hour. Each snapshot is stored, so every item has an hourly price history. History older than 12 months keeps one point per day.
The price of an item is the average unit price of the cheapest 15% of the units on offer. With fewer than 14 units on offer it is the cheapest listing. Lowest is the cheapest single listing.
Popular items have the highest estimated traded value over about the last day: the units that left the auction house, times the price. Sold, expired and cancelled auctions look the same in the data, so this measures activity, not sales.
Both regions are covered, EU and US, with every rule set and the Alliance, Horde and neutral auction houses of each. Which of the two roleplay rule sets is which is not confirmed yet. All times are server time.
Forever Goblin is not affiliated with Blizzard Entertainment.