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, [...]

GoDaddy currently has a special rate of $1.99 for any domain (.com, .us, .mobi, .biz, .net, or .me) but you need to read the fine print carefully:

The special rate of $1.99 per domain name per year only lasts for the first year. After that, the price goes back to $10.69 per domain per year [...]

Update (Dec 2009): DynoNames.com still offers their sale on .info domain names: $1.99 per domain name for the first year before eventually returning to the regular price of  $7.39 per domain name per year. If you try to buy a domain name with DynoNames, you’ll find it’s really a Wild West Reseller. Check out our domain [...]

Update (Dec 2009): NameCheap.com is now offering .info domain names for $1.99 per domain name for the first year before returning to the regular price of $9.69 per domain name per year. Domain privacy registration is $2.88 per domain name per year, although they offer volume privacy rates. Check out our sortable domain name price [...]