.Biz Domain for $3.99For the next 3 days (till the last day of April), 1and1 is offering *.BIZ domain names for as low as $3.99 for the first year. And other domain names (.com, .net etc.) for just $6.99 for the first year. From second year onwards normal charges of $8.99 will be applied.
Here's a comparison between 1and1, Yahoo and GoDaddy
They are also offering 50% discounts on Hosting services too -
So before the offer ends, Grab Your Own Domain and Hosting