If you can't find a replacement in Brazil, while Parts4repair.com is in China, their prices are good, the repair parts work, and they ship all over the world.

I have gotten an N9 and an N97 touchscreens from them and am pleased with my ability to fix the broken screens myself.

Here is their Nokia N900 parts which includes touchscreen replacement: http://talk.maemo.org/showthread.php...35#post1276035