Lexie, I'm not sure I understand what you mean here... As long as it's below or exactly 30USD, then it's fine...
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What I mean is that, in order to have more or less an idea of how much they would charge you for the shipping and handling of the DVD if you were to send it to South America, I'd have a look at Amazon's page to see how much they'd charge for a similar shipment. In that way, I'd add the freight costs to the original value that appears next to the film to see if the final cost would be within your budget.
Amazon probably has some "gift" sending option available, so then you can just calculate for shipping to your address directly from Amazon :) I haven't looked into the gift option, but I'll probably use that if they have it, because that is faster and less expensive.