I have found the cheapest registrar services as of today are:

Name.com with free privacy and free Google Apps
Domainsite.com with 50 cents privacy and free Google Apps
1and1.com with free privacy

And GoDaddy should be renamed TrickyDaddy as they charge a hidden $0.20 cents ICANN Fee at checkout... it's not that much but if you have only one buck and you want to buy a $0.99 INFO domain, you will find that the final price is $1.19 so your buck is not worth