The best domain name price we could find with Netfirms was $7.99 USD for a .com domain name for the first year. (The second year returns to the regular price for Netfirms which is $9.95 per year per domain name.)
There are a few nice things about Netfirms that caught our eye:

Although they’re not the cheapest, [...]

Dotster currently has a sale on .net domain names which are going for $8.99 per domain name per year. Their .com domains go for $15.95 per domain name per year and they charge $6.99 per domain name per year if you want to protect your registration information from the WHOIS database.
At the time of research, [...]

We use Bluehost to host our websites. We used to love them, but they’ve changed their domain name privacy registration policy and so now we’re looking elsewhere to buy our domain names.
Bluehost used to charge $10 per domain name per year, which is a tad on the pricey side, but it came with free Domain [...]

Update (Dec 2009): DomainsAreFree.com still offers a sale price on .com, .org and .net domains:  $3.99 per domain name for the first year before returning to the regular price of $14.95 per domain name per year. Domain privacy is now listed as $8.99 per domain name per year. There are domain registrars that offer cheaper [...]

Update (Dec 2009): After researching over 20 of the top domain name registrars, 1&1 Internet is quickly becoming one of our top picks. The big 5 domain types (.com, .info, .biz, .org, and .net) have a regular price of $8.99 per domain name per year. 1&1 still offers $0.99 for a .info domain name and [...]