Hi there, welcome to the forum.
It's Eternal solution, not external
Anyway, they are a hosting company (not domain registrar). And I do not recommend from buying domain name from a hosting company. Less control, and probably has some other restriction.
I used Godaddy before. Around USD$7 or 8. But the interface is really bad, and they are always push you to buy something to earn more money. Which, I really hate.
Around 1 and half years ago, I found
namecheap. And, I have been with them ever since. With coupon "BESTVALUE", it is only USD$7.99 for one domain name. The interface is the best I everseen. And you have the option to list your domains for sales instantly in the marketplace by few buttons. I have around 20+ domains with them.