Typically, you are expected to come up with a domain name and register the name with a domain name registrar. Following this part, you can get a domain name at an affordable price. When a domain name you want to use has already been registered by another person, the registrar will inform you that it has already been taken. If the registered owner of the domain name wants to sell, you can reach out to them and purchase it. The owner may want to sell at a very high price. Another thing you can do when a domain name you have in mind has already been registered is to find an alternative. The registrar may suggest a few other domain names that are free. You can choose any of the suggested ones or come up with another one and check its availability.