The catalog taxonomy files Mage under Glyph. Everything listed below shares that subclass, which makes this a focused market view rather than the whole Glyph shelf.
Pricing here moves the same way the rest of the catalog does — Retail pulls hourly from the Blizzard Auction House API, while the classic editions pull from TradeSkillMaster on their own cadences. Each snapshot is timestamped, so the detail page for any row below plots real movement over time.
Use the search box on the item database home page to jump to a specific item by name, or use the breadcrumb above to step back up to the full Glyph category.