Internet.bs is $7.49 for the first year, and $8.35 for renewals. I have a coupon site for domains and hosting (see sig) and Godaddy new registrations and renewals are $7.49 using the coupons. If you "like" us on facebook, you can be first to find out about special $1.49 godaddy deals.
When looking for cheap domains, also look for reliability and many other factors. Some registrars sell domain at cheap rates but charge you for associated services like privacy or DNS management etc, hence before ordering check out what is going to be total cost.
I use godaddy's discounted domain club. It's $90/year and gives you the best price on domains. If you have 20+ domains you'll pay for the first year's cost right away.
it dpends on hte time of the year. Some registrar have sales. godaddy is one of them. Alsom every month. 1 and 1 has sales. today it's $4.99 for .com and 0.99 for info. yahoo always has a sale. $3.95
This coupon recently worked for me - 5DOLLARCOM - at http://www.namesilo.com They run specials/coupons most of the time - if you hunt the codes down.
For .com's godaddy has many coupon codes to get them for as low as $7.47 and even sometimes they offer .com's for about $1-2 but you need CC for that. For .info's Godaddy is the cheapest registrar as well.