There are different options for eCommerce marketplace development.
Go with SaaS solutions or website builders, which let you build a generic marketplace. This option has a price range of $1000 – $5,000.
Use API-based software or build necessary features on top of open-source software. In the latter case, you’ll require development skills or hire a team of eCommerce marketplace developers. The budget ranges from $5,000 to $50,000.
Build a custom marketplace from scratch, which enables you to build personalized business logic. The rough estimate for this option is $50,000-$300,000+.