Merchant

From Guild Wars Wiki

A merchant is an NPC that buys and sell items, such as identification and salvage kits, as well as more exotic commodities, such as sweets or alcohol. Merchants will also sell the applicable key for the region they are located in. Unlike traders, merchants sell their wares at fixed prices that do not vary according to supply and demand. In Factions, certain merchants will only trade with members of their own faction (Kurzick or Luxon, depending on unspent Faction on one's account).

Where applicable, items are sold to a merchant for half the value they would otherwise be bought for. For example, a merchant would offer 25 gold for a grey Vial of Dye, which would cost 50 gold to buy. Some items, such as quest items, are not accepted by merchants and so cannot be sold.

Merchants can be identified by the word [Merchant] after their name.