There are three different locations players are able to purchase Nutmeg Seeds in Bulk. These locations are Queensdale from Farmer Eda, Kessex Hills from Deputy Jenks and Gendarran Fields from Milton Book. Now before I get started with telling you the two locations keep in mind in order to purchase any goods from a Karma vendor you must first complete the quest they have for you. That is of course if they have a quest available if not you'll be able to buy whatever they're selling right away.
The first of the vendors I am going to go over is Deputy Jenks located in Kessex Hills as he has more than just one Karma good for sale. Deputy Jenks can be found in southeastern Kessex Hills by the Overlake Haven Waypoint.
Deputy Jenks has quite the selection of Karma goods for sale. Not only does he sell Nutmeg Seeds but he also sells Black Beans and Bananas in Bulk. It's something you'll want to keep in mind if you need more than one Karma item and you want a one stop shop type of NPC.
The second Karma Vendor you can go to is Farmer Eda who has two different things you can buy from her as well! Farmer Eda is located in the far northwestern end of Queensdale in the level 1 - 3 area of the zone. She is just west of Orchard Waypoint, if you port there you'll be able to run to her within seconds.
Milton Books is a Karma vendor in Gendarran Fields with a ton of different Karma foods available. He is just above Lion's Arch so he should be your first choice if you need an item that is sold by him since the port will cost so little. Milton Book sells Nutmeg Seeds, Lemons, Cumin and Celery Stalks all for 35 Karma each. He's the biggest one stop shop Karma vendor in the game.