Ethical options at grocery stores are increasing. But when it comes to organic produce and other items, Costco is superior to Sam's Club. Here's why.

Listeria monocytogenes [is] an organism which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems," the FDA said.

Member's Mark freeze dried fruit variety packs were distributed and sold in Sam's Club retail stores across the majority of the country.