See sig.
CjOverkill has a country redirect option. It works without htaccess and can use mod_geoip if your server has it installed or a builtin database if your server has no mod_geoip.
The country filter redirects any country to any site you want, so basically you can filter it to your brazillian site or to a brazillian sponsor if you want.
Also if you whitelist your IP, then you will filter your site for everyone in your country except you. It's a good option if you want to be able to see how your site works.
http://www.cjoverkill.com