More than 120 million Americans are members at wholesale clubs like Costco, Sam's Club and BJ's — and they're each potentially saving thousands of dollars a year at the register.

On Sunday — Earth Day — Whole Foods will stop selling wild seafood that's either overfished or caught in a harmful way, according to ratings from the Blue Ocean Institute and the Monterey Bay Aquarium.

British supermarket company Tesco tried to expand into the U.S. under the Fresh & Easy brand. The effort has since proven fruitless. Investors are now pressuring Tesco to focus on the business back home.