It depends on the return policy of the supplier. In some cases (defective product, etc.), it is possible that the supplier may be willing to cover the cost of shipping, but it depends entirely on the return policy listed.
Before importing products, please read and become familiar with each supplier's return policy.
Where can I find the Return Policy of a Brand?
To find the Brand's Return Policy, first, visit the Brand's Page, and then click on "Supplier Data." On the right-hand side, you will see the brand's return policy.