How do I sell products on NeweggBusiness? To become a NeweggBusiness Marketplace Seller, you will need to complete the Seller Application Form. Updated on November 29, 2021 Related Articles What are “Shipped by Newegg” Marketplace items? How long does it take Marketplace vendors to process orders before they are shipped? How do I return a NeweggBusiness Marketplace item? How do I contact a Marketplace Seller? What is the return policy for Marketplace items?