Directi (aka publicdomainregistry aka resellerclub) is a whitelabel registrar in that, despite its name, it only seriously attempts to sell to its resellers. Members of the general public purchase domains from directi resellers. Different resellers have different prices. Some sell .infos for $1.20. One directi reseller is creativeon.com. You can find a list of domain resellers here:

http://domain-registration.domaintools.com/