The e-commerce software market is extremely saturated, and pricing varies widely. For B2B organizations, a price range of $5000 to $55,000 for a project that includes design, development and implementation can be expected. This can further vary depending on the types of customizations and functionalities you might require for your web store.
Self-hosted e-commerce projects and e-commerce websites that are not ERP-integrated run the risk of incurring some sizable added costs to connect systems. For instance, you might need to pay a large implementation fee (and potentially recurring fee) for any middleware or connectors that are needed to unify your e-commerce solution ecosystem (in addition to those of the software itself).