The cost of constructing a Magento 2 store with a Hyvä theme can vary widely depending on several factors. These include the complexity of your e-commerce site, the specific features and functionalities you require, the extent of customization needed for the Hyvä theme, and whether you choose to work with an agency or do it in-house. Typically, building a Magento 2 store with a Hyvä theme may involve expenses for theme development, extensions, hosting, maintenance, and ongoing updates. For a rough estimate on development cost, it’s advisable to consult with Magento developers or agencies who can provide a tailored quote based on your unique business needs and goals.