that's usually a seller that has Walmart or Amazon fulfilling all of their orders and has multiple storefronts connected to that fulfillment program. Shopify is

that's usually a seller that has Walmart or Amazon fulfilling all of their orders and has multiple storefronts connected to that fulfillment program. Shopify is one, but there are many others i don't know about. I've been looking into it to resell some small parts in small quantities. just bag and tag them with an SKU that matches what you give Amazon, and they will pack and ship it for you.