RoS Smithing Tradeskill Suppliers
Some of the tradeskill reagents used in Ring of Scale Smithing recipes are only sold from a handful of Smithing Suppliers in the game. Blacksmith Gerta and Borik Darkanvil sell the items in Plane of Knowledge and are easily found on Find, however outside of PoK you can only buy these ingredients in The Overthere (RoS) and Stratos (Burning Lands).
Smithing isn't the only tradeskill like this, almost every tradeskill that got new recipes in Ring of Scale have unique items which can only be purchased from a few NPCs. This page is here to show you the locations of each NPC to hopefully make them easier to find.
Blacksmith Gerta & Borik Darkanvil - PoK (Smithing Supplies)
Borik Darkanvil is one of the Smithing Supplies vendors that was added into the game during the Planes of Power expansion pack, so, immediately when Plane of Knowledge goes live on your server. There are additional Smithing Supply NPCs inside the same building that Borik is in. Use Find if you're having trouble locating him.
The other NPC shown above is Blacksmith Gerta who won't be added into the game until during the Call of the Forsaken expansion pack.
Mercator Macatus - The Overthere (RoS)
Aside from Plane of Knowledge, you can also buy the required items for many Conflagrant recipes from Mercator Macatus who is located in the center of the outpost in The Overthere (RoS).
Sagacious Great Jade - Stratos: Zephyr's Flight