One of my current favorites is the No-Beef Vegan stock. Somehow, they are able to take roasted vegetables, concentrate them down, and create a dark, rich, delicious base that tastes like beef, without the fat and animal content of the regular beef base. I found it at the local health food market (but not Whole Foods, surprisingly) for somewhere between $4.99 and $6.99 for the 8 oz jar. I know that sounds expensive, but it's a very, very concentrated product, which makes at least 2 1/2 gallons or about 36 cups of broth depending on how strong you make your liquid.
This product has an unopened shelf-life of 2 years from production date; once opened, it needs to be used by the "best by date". Although it says "refrigerate after opening" on the jar, the company website specifically says it does not need to be refrigerated after opening, so if you forget to get it back in the fridge, you're still ok, and not out the money you paid for it.
This is a product I definitely intend to keep regularly in my kitchen. I may even purchase it by bulk and sell off extras at my cost to friends who have a hard time finding it.
I would bet money on the No Chicken Vegan base being just as good; doesn't your mouth just water thinking of a creamy-chicken flavored casserole or chicken gravy on biscuits?