49 parts trade goods items
The Forever catalog holds 49 parts trade goods items, topping out at item level 60 with Obsidian Blasting Powder, Delicate Arcanite Converter, EZ-Thro Shell. Every crafting material in the game: herbs, ores, bars, cloth, leather, gems, enchanting materials, and reagents. The supply side of the whole crafted economy, with prices and 7, 30, and 90 day history per market.
By quality: 46 common, 2 uncommon, 1 rare. Item levels run from 1 to 60, for characters from level 1 to 45. 2 bind when picked up and never reach the auction house; 47 can be listed.
The highest item levels here: Obsidian Blasting Powder (60), Delicate Arcanite Converter (58), EZ-Thro Shell (57), SAF-T Tube (55).
Professions make 40 of them: Engineering (37), Blacksmithing (2), Alchemy (1). The rest drop, are sold by vendors, or come from quests.
Source: World of Warcraft: Forever game data and Blizzard's Game Data API. Updated with each game build.