Enchanting materials come from disenchanting unwanted gear, so their supply rises exactly when gear prices fall. This page narrows Tradeskill down to Enchanting only, so the table stays scoped to one subtype instead of the full category list.
Each Enchanting 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.
The "Browse subcategories" links on the parent Tradeskill page list every other subtype if you want to compare markets side by side.