Materials — one of the subtypes World of Warcraft files under Tradeskill — gets this table as a focused view: the same drill-down the in-game Auction House browser applies when you filter by subcategory.
Each Materials row links to a detail page showing the current minimum buyout, the average and median sale price, and total quantity listed. The realm selector compares the same item across servers, and the edition selector appears wherever an item exists in more than one game version.
If you want the full Tradeskill category rather than only Materials, the breadcrumb above steps back up one level; otherwise the table below covers every tracked item in this subclass.