You can buy these stamps at :
http://shopping.correios.com.br/wbm/store/script/wbm2400901p01.aspx?cd_company=ErZW8Dm9i54=&cd_product=oy89IMx9W9M=&cd_department=PNUSU9J0RsE=
This is the banner I created for the launching of the set of stamps.
Three stamps are my creation and the one with the hat and the musical notes was created by Jamile Costa Sallum, designer and my dear friend.