Everyone in Latin America who buys things in Amazon and other places alike has mail boxes, normally in Miami.

Why, does delivery come up cheaper (I mean for those e-stores that do deliver internationally, like Amazon)?

Hm, actually this service sounds handy. Most US outlets selling computer-related stuff don't deliver internationally, Amazon sells second-hand books to only 20 or so countries etc. Do tell some more about the service, please.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue