Walmart stands out as one of the largest retailers in the United States, with a substantial hold on various market segments ranging from clothing to fresh produce. In 2009, Walmart launched its online marketplace, giving eCommerce businesses access to millions of potential customers across the United States (and dozens of countries around the world). However, having access to so many people isn’t free. If you’re unfamiliar with selling on Walmart and the marketplace fees that come with it, you should continue reading.