Yeah right. You think i trust the mexican post office with a 700 dollar item and they won't hold it for a month or two? I've had plenty of coworkers tell me they send things down to Mexico or South America and it gets jacked by postal workers on the way and they sell it or keep it for themselves.
South of here it's pretty much all third world countries where corruption is rampant.
Maybe DHL would work but then it is a customs wait and fee I think. Personally I think maybe just craigslist "buy me an N9 and walk it across over to here and I'll give you 100 extra" would probably work out better.