Arcun

Location
is the Mystery Merchant you will find in Arcadia Area.
 * Crescentia
 * Lumbertown in camp near Lumbertown bridge
 * Faevine Vale Camp in Fey Forest
 * Maon's Cabin in Fey Forest
 * Two Oaks Ranch in Valley of Titans, south of Lumbertown
 * Godric's Farm in Celestial Hills
 * Sanctum Mysterium in southern Celestial Hills
 * Marshlands in Tuwangi Mire
 * Tuwangi Garrison in Tuwangi Mire
 * Vanguard Outpost in Oblivion Woods, north of Crescentia

Mystery Merchant Shop
's shop information can be found in this list here

Trivia
The only Difference in the all of Arborea's Goblin merchants in the color of their backpack. Varrek has a brown Backpack