Domain prices vary depending on the TLD ‒ the extension, e.g., .COM, .SHOP, .ORG, etc. ‒ you'd like to use for your domain name, and if there are any special offers at the moment.
Additionally, some TLDs allow registering a domain for more than one year. This way, you may get a better deal by registering your domain for a longer duration.
You can check all the available domains and their pricing here: Domain Name Search and Registration. Once you open that page, enter your desired domain name and click on Search. You will be presented with several options to choose from and the price of each:
Select the desired name by clicking on Add to cart. In the cart, you can check the registration price for more than one year, if available, as well as the domain renewal price:
Now you know how much your domain costs and may proceed with the purchase.