Anyone take their touch pro2 to Costa Rica?

[BoilerUp]

I'm heading to Costa Rica next month and will need my phone to work to make a few quick calls. I'll need to call both the U.S. and my stepbrother, who has a brazilian phone, but will be in Costa Rica with me.

What's the best way to do this, should i get a prepaid sim card? or activate international roaming through sprint.

Any input would be appreciated, thanks.