And, here are my favorite spots for buying the other items that are needed for the Wu Armor:

For the Vial's of Viscous Mana:
Items
 Zone NPC
Pearl Northern Felwithe Merchant Tyslin
Pearl Commonlands Katha Firespinner
Poison Vial East Freeport (Arena) Eyasie Dyrius
Poison Vial East Freeport (Arena) Quareran Borius

For the Heady Kiola:
Items
 Zone NPC
Packet of Kiola Sap Rivervale (Fool's Gold) Flyndia Berina
Packet of Kiola Sap Rivervale (Fool's Gold) Mac Deeppockets
Bottle Rivervale (Fool's Gold) Mac Deeppockets
Water Rivervale (druid area) Daleen Leafsway