This item is acquired in-game. See its sources below.
In the Appearances collection, Deathbinder's Staff is listed as World Drop. Appearance ID: 43031.
Read from the World of Warcraft client build files.
In their in-game specialization descriptions, these specs name staves among their preferred weapons:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
First-party render from the game files. Model © Blizzard Entertainment.
Deathbinder's Staff is not traded on the Auction House, so it has no Auction House price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB