Your domain name registration, purchased from a reputable company should run you somewhere between $1-10, depending on the extension and the amount of time you sign up for.Probably the most important aspect of your domain name registration is the choice of keywords to use in your domain name. Try to use the main keyword or phrase you'd like to optimize the whole site for, and see if you can craft a domain name around it. The search engines seem to favor keyword-rich domain names. Nuff said. Keep it short if possible. A shorter name is easier to remember than a long one.