A WooCommerce site can cost you anywhere between $0 and several thousand dollars.
While the core WooCommerce plugin is free, you can spend quite a bit of money on development and maintenance services, depending on how ambitious your project is.
If you go crazy buying a bunch of extensions for your WooCommerce Store, you’ll have to pay the yearly support and renewal fees that most of the plugin vendors charge.
And of course, you have to pay for your hosting.
In general, the costs for a WooCommerce site are pretty manageable, especially when you’re just getting started. By the time your costs become significant your store may already be bringing in more than enough revenue to justify the expenses.
Just don’t go crazy buying a ton of add-ons and you should be able to keep your expenses to a minimum.