Chris wants to get a domain name for a specific country. Leo says that the international organization called ICANN approves registries and country codes for all domains. Leo suggests Google searching for the domain registry for his country code. Any registrar will work if they support registering the country code he wants.
AmericaRegistry.com is a good place to start. But he may run afoul of laws pertaining to that country. Brazil, for instance, requires a Brazilian tax ID to buy a domain with their country code.