There are many other costs involved in shipping a product in addition to postage. Are you monitoring your delivery area surcharge (DAS) or extended delivery area surcharge (EDAS)? Most carriers have these charges.
Seeing the success of Amazon’s outsourced fulfillment service Fulfilled By Amazon (FBA), many marketplaces and eCommerce platforms are racing to build their own fulfillment networks. No doubt, it is beneficial for sellers to have access to third-party fulfillment services wherever they choose to sell, but at what cost? Do these marketplaces have the sellers’ best interests at heart?