Webflow prices vary depending on your needs:
Showcase site from $0 to $432 per year
E-commerce site from 348$ to 2544$ per year
Workspace from $0 to $588 per seat/year
There are two types of paid plans:
Site plans: allow you to unlock certain features and publish your site on a custom domain name
Workspace plans: allow several people to collaborate on the same account
You can always try Webflow with the free version: the "starter" plans.