Cheapest, reputable domain name registrars. Some of the firms listed here only do domain registration, but most also offer Web hosting and other services.
The prices listed here are for a standard new customer for one .com domain for one year.
You can usually get discounts when you register domains for more than one year. Non .com top-level domains (eg., .net, .org, .mobi, .biz) are sometimes offered for registration at a lower price, especially if you just registered the .com version.
2. Hostway
$7.95 per year.
3. 1&1
$6.99 per year.
Full service Web firm that offers Web hosting (shared, VPS, dedicated), domain name registration, and more.
4. GoDaddy
$9.99 per year.
If you purchase a non-domain product from them (eg., hosting, SSL certificate), you can register domains for $1.99.
5. Yahoo Domains
$9.95 for one year.
If you host with them, you get one free domain name registration.
6. estdomains
$7.19 per year.