you can ship from any post office. sea mail is the only option that makes sense and takes about a month. i wouldn't ship too many fake purses/watches unless you're looking for a customs headache. incidentally, once i bought a suit in hk for around $400 and had it shipped to the us because i didn't have time to pick it up. when it arrived in oakland, i had to pay a whopping duty (maybe 100%, but i can't recall the exact number) just to get it. bottom line: keep your declared value low.
cost is $30-$40 for heavyish boxes.