Where can I buy nutritional yeast and how long does it keep once opened?

Okay, I have some recipes that call for nutritional yeast and I want to know if I can find it at a regular grocery store. If so, what section is it normally in? Stores in my area are Ingles, Wal-Mart, Bi-Lo, Publix, Kroger, and Piggly Wiggly (the big chains, there are also some smaller grocery stores). Also,... show more Okay, I have some recipes that call for nutritional yeast and I want to know if I can find it at a regular grocery store. If so, what section is it normally in? Stores in my area are Ingles, Wal-Mart, Bi-Lo, Publix, Kroger, and Piggly Wiggly (the big chains, there are also some smaller grocery stores). Also, how long will it keep once opened? I don't cook often, so I tend to let stuff ruin sometimes. Thanks!
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