Instead of a subdomain like sitename.stackexchange.com, It would be great to have our site at a domain like mysite.com. Many sites like askubuntu.com already have dedicated domain names. How do we get it?
Long story short — unless there are extraordinary, game-changing circumstances that warrant adding a custom domain name, we simply aren't doing custom domain names for any sites as a matter of policy.
Here's a bit of background: