6th grade teacher looking for a Canadian or Mexican class to collaborate with students

I'm a 6th grade teacher in Colorado, and part of our geography standards is to understand our neighbors to the North and South (Canada & Mexico). I'm looking for a fifth, sixth, or seventh grade class that my students can collaborate with using varying methods of communication (our class wikispace, Skype & videoconferencing, email, etc.) so we can share, understand, and respect our cultures. Thanks!