I'm traveling in Brazil and was happy to find this alternative to expensive (but crappy) hotel wi-fi.
MicroSIM Card | Vivoblog
R$10 (USD5.69)* for the microsim...
prepaid plans like
1 day access (capped at 150MB) R$12 (USD6.83)*
1 week access (capped at 250MB) R$35 (USD19.91)*
1 month access (capped at 1GB) R$130 (USD73.96)*
*at the time of this post