The account
https://twitter.com/domainname looks to be taken by the owner of 4.cn which looks to be a serious marketplace for domains; moreover, the chance of even offering money to obtain this account is slim to none.
There are however websites that monitor twitter accounts and will obtain them for you if they are ever dropped, deleted, or suspended; off the top of my head I can't think of the websites, but @beer was picked up with this method.
If however you are looking at a different account that does have 0 tweets and 1 follower then you can follow the user and message him to see if you can obtain the twitter account. Other than that, I do not know of any other service that controls the transaction between twitter accounts as Twitter takes no responsibility for this action.
Thanks,
Jason