たまには攻略ぽいのを・・・
Thottbotでざっとみて出てきた各Repアイテムのヴェンダー

Agent Crusade
Ice Crown (88.76) Veteran Crusader Alioccha Segard

The Sons of Hodir
The Storm Peaks (66.61) Lillehoff

Horde Expedition
Borean Tundra (41.54) Gara Skullcrush
Howling Fjord (80.31) Sebastian Crane

The Wyrmcest Accord
Dragonblight (60.53) Clelstrasza

Knights of the Ebon Blade
Ice Crown (43.21) Duchess Mynx

The Oracles
Sholazar Basin (54.55) Green

The Kalu'ak
Dragon Blight (48.75) Sdiruk
Howling Fjord (25.59) Tanaika