You can import a product from a supplier store and sell it on your online store for a higher or lower price. It´s up to you. Let's say the retail price of the product is $100, and the supplier store charges a $5 shipping fee. This store must give you at least 25% off. This means after you sell this store's product on your online store, you will have to pay the supplier store $75 + $5 = $80. You can sell it on your online store for $100 and offer free shipping to attract more customers. Even in this scenario, you would make $20 profit.
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You can supply your products, and hundreds of stores could import and sell your products on their online store. If your retail price is $100, and if you offer 30% discount, Retailers will pay you $70 for purchasing your product once they sell it to their customers. If you have a product cost of $40, you would make $30 profit.