This page narrows Armor down to Libram only, so the table stays scoped to one subtype instead of the full category list.
Each Libram 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 Armor category rather than only Libram, the breadcrumb above steps back up one level; otherwise the table below covers every tracked item in this subclass.