Collectors and Quartermasters

"Where do I trade in Monastery Credits?"
— random adventurer, Shing Jea Monastery

"What do I do with Battle Commendations?"
— random Sunspear, Kamadan

Collectors

Collectors conduct their trade both inside and outside towns, sometimes in unlikely and inhospitable places. For various reasons, collectors want large quantities of trophy items from enemies you slay in the wild, and they're willing to trade for them. Some offer a wide variety of powerful weapons and other useful items in exchange; others can provide high-quality armor. Even if you don't have an immediate need for a Collector's reward, you can usually still make a profit from it, either by selling it to another character or finding a merchant who'll buy it. A Collector's name is followed by the word [Collector]. http://www.guildwars.com/gameplay/gwnfeatures/collectors.php