Shopify has free and paid themes for you available. You can pick and choose different themes to see how the designs are suiting your website shop. The paid premium themes for Shopify you can get in a price range of around 50 to 180 dollars. Of course this is a one time purchase and there are no monthly recurring costs for a premium theme.
When you are just starting with your online shop and you only want to test around for a while it is better to start with a free theme from Shopify. There is always the option to later upgrade to using a premium theme.
If your online shop business is getting serious you might profit a lot by using or upgrading to a premium theme. These themes are often much more detailed than free themes and offer more functionality and customizability. Premium themes are created by professional theme designers and are completely optimized for doing online shop business and growing the shop by increased sales.
