I'm not alone; according to Walmart's website, the retail giant receives 14.5 billion customer visits per year. In some ways, I'm surprised the Berkshires doesn't have at least one more Walmart store, but that's the case. Another aspect that kind of surprises me is Walmart's top-selling product. So, why is the banana Walmart's top-selling item? LOOK: Top pizza chains in the US 30 biggest pizza chains in the country based on annual sales in 2023.