290 staff weapon items
The Forever catalog holds 290 staff weapon items, topping out at item level 90 with 90 Epic Frost Staff, 90 Green Frost Staff, Atiesh, Greatstaff of the Guardian. Every weapon in the Forever catalog, from the vanilla dungeon and raid drops to the new Forever additions, sorted by item level with daggers, swords, staves, polearms, bows, guns, and wands as filters.
By quality: 83 rare, 81 epic, 71 uncommon, 32 common, 15 poor, 8 legendary. Item levels run from 1 to 90, for characters from level 1 to 60. 95 bind when picked up and never reach the auction house; 195 can be listed.
The highest item levels here: 90 Epic Frost Staff (90), 90 Green Frost Staff (90), Atiesh, Greatstaff of the Guardian (90), Atiesh, Greatstaff of the Guardian (90).
One profession makes 4 of them: Enchanting (4). 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.