Go with GoDaddy

One FREE .COM, .COM.MX, .COM.BR, .CA, .UK, .CO.UK, .CO, .NET, or .ORG with purchase of a new 12-, 24- or 36-month plan. You must add the domain name into your cart before purchase, and you must select a domain term length equal to or less than the term length of your plan to qualify for the free domain offer. If you purchase a domain name for a term longer than the term of the plan, you will be charged for the additional registration term at the then-current rate. Cannot be used in conjunction with any other offer, sale, discount or promotion. Free domain offer applies only to the initial purchase term. After the initial purchase term, domains purchased through this offer will renew at the then-current renewal price.

* Plus ICANN fee of $0.18 per year.

Sale/introductory pricing valid for the initial purchase term only. Product renewal pricing subject to change.

Products will automatically renew until cancelled. You may turn off the auto-renewal feature by visiting your GoDaddy account.