Refined ingredients cannot be deposited as collectible items in storage.
 List of ingredients
Ingredients listed in italics can only be gathered from resource nodes.
From Update notes 8th September 2012:
"The following Cooking Materials are no longer sold for Karma and are now acquired through drops, gathering nodes, or loot bags: Butter, Chocolate, Vanilla Beans, Chili Peppers, Thyme, Black Peppercorns, Cinnamon, Bay Leaves, Walnuts, and Oranges."
Some of the harvestable ingredients can only be found in a few very specific locations. Check each ingredient's main page for more information on locating these Node farms.
These ingredients can be found while using logging axes on trees throughout Tyria.
The two meat ingredients, Slab of Red Meat and Slab of Poultry Meat, can be obtained as a drop from defeating animals. Slabs of meat can also be obtained from opening Icy Bag line of packages and perhaps from other packages. Eggs are also dropped by enemy creatures.
 Loot Bags
Many enemies drop different types of loot bags which yield a random assortment of items when opened. Ingredients that are exclusively found as a random drop inside these bags are:
 Common Karma Vendors
There are Karma Vendors scattered throughout major cities that all sell the same 3 ingredients.
These items can also be purchased in bulk from Master Chefs.
 Master Chefs
A Master Chef can not only give you the ability to cook, but they also sell a variety of ingredients in bulk amounts.
 Cooking Supplies for Coin
 Cooking Supplies for Karma
 Other Karma and Coin Vendors
These ingredients can be obtained by purchase from NPC vendors, usually in bulk. They are either sold individually by special merchants for coin (as is the case with Apple Jack) or sold in bulk for karma by various Renown Heart NPCs (only after their Renown Heart has been completed.) Also, some of these ingredients appear to be obtained from the Icy Bag group of packages. This has been reported with Green Beans and Shallots in Heavy icy bags, Green Beans in Large Icy Bags, Almonds in Icy Bags, Kidney Beans in Small Icy Bags, and Celery Stalks in Tiny Icy Bags. These ingredients are still account bound when obtained from icy bags.