Bartering Summary NZ
This page may be out of date. Current information is available at Bartering. 
This page lists Bartering NPCs whose names start with N through Z, what items they are looking for, and what you'll get in return. For A through M, check here.
Norbert, found in Sun Vale, Animal Town.
Give  Receive 

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Percy Evans, found at his home in the North East of Eltibule.
At [Friends] Percy offers to barter with you:
Give  Receive 

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x1 
Qatik, found at the Red Wing Casino. Qatik will trade Council Certificates in exchange for Windfall Stones, or Red Wing Crowns (of random rarity^{needs confirmation} and varying level) in exchange for Crown Tokens
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Tadion, found in Serbule Keep.
Give  Receive 

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The Sand Seer, found in Ilmari, Amulna. At [Like Family] The Sand Seer offers to barter with you:
Give  Receive 

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Ukorga, found in Kur, Northwestern Outpost. Ukorga will barter various winter gear (of level 40^{needs confirmation} and random rarity^{needs confirmation}) as well as a crossbow, in exchange for the player's choice of Tufts of Fur, Winterhue Seeds, or Silver Ore.
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Urglemarg, found in Sun Vale, southern ocean. Urglemarg barters items (of random rarity^{needs confirmation}) which boost underwater survivability and mobility, in exchange for Sand Dollars.
Standard items possess level 35 enchantments, fancy versions have level 40 enchantments, while extrafancy gear comes with enchantments of level 45.
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Yagreet, found in Sun Vale, Fairy Tree.
Give  Receive 

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Yalox, found in Goblin Dungeon, left from The Fog. At [Friends] Yalox offers to barter with you:
Give  Receive 

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x2  
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x2 
Zeratak, found at the Mantis Outpost to the north of Serbule. Zeratak will offer gear of level 10^{needs confirmation} and random rarity^{needs confirmation} in exchange for a combination of Brains and Brain Bug Lobes:
Give  Receive 

x3 x2 

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x4 x3 