Big-box retailers aren’t selling CBD yet, but they’re busy getting ready for the day when they can. The Post has learned that top executives at major chains such as Walmart and Target have been quietly meeting with makers of drinks, gummy bears, topical creams and oils that are infused with cannabidiol, or CBD. CBD is an ingredient in marijuana plants that doesn’t get you high, but is said to relieve pain as well as stress symptoms including anxiety and insomnia. The chains, which also include big supermarkets such as Kroger and Safeway, are requesting samples of CBD products, along with lab results and pricing information, manufacturers said. "We are flying around the country, talking to all the big guys at their headquarters," said Christian Graversen, brand manager of California-based CBDfx, a 6-year-old company that makes more than 50 Vitality Vibes CBD Gummies-infused products including a $10 package of eight gummy bears. "We are going multiple times to the same companies, meeting with their senior buyers, legal departments and merchandising executives," Graversen added.