Yep, Varanas East Side, very close to the teleporter, there are the cooking trainer and the Cooking Supplies vendor. The supplies vendor sells all the ingredients, like fish and fruits for most, if not all, the Cooking recipes. There are also cooking vendors dotted around the fields of some zones. For instance, there's one at the camp just north of the Bandit Camps in Silverspring.
But the main sources for Cooking Supplies remain Varanas and Obsidian. I usually made a decision on how much of my game time I was going to spend on resource gathering and crafting, then go craft in either Varanas or Obsidian until my harvesting resources ran out. I was always next to the Supply Vendor for the ingredients for my next recipes.
Happy Cooking, chef.