The beginning
First quest comes from Ponzo "Get rich Quick" which is an introduction and rewards 1 Barter Brick.
After you hit Rank 3 with Loam Niffen, you will get a quest to talk to Ponzo. This leads to a quest (Bartering 101) that takes you to Valdrakken and also rewards 10 Barter Bricks.
You will now unlock daily quests, in which of these quests rewards 5 Barter Bricks each, meaning 10 in total per day. The other quest(s) are tied to your profession and rewards 3 Knowledge points.
Sniffseeking
Completing a sniffseeking can reward 2-4 Barter Bricks.
There are also quest items that you can find when sniffseeking that rewards 2 Barter Bricks when completed. This seems to require Renown 9 to unlock.
There is also a mouse (Treasurewhiskers) that you can look for when sniffseeking that rewards 2 Barter Bricks when killing it. This seems to require Renown 9 to unlock.
Treasures
There are special trasures called "Ritual Offering" in the Zaqali Caldera area in Zaralek Cavern. You can get a cap of 4 Barter Bricks a day from them.
There is also a daily treasure called Witherlodge in Zaralek Cavern that can contain 1 Barter Brick.
Rares
Low chance on getting them from rares.
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