The other option would be to mail the package to yourself at the San Pedro post office. It would cost around $US60 for mailing USPS priority and then whatever it costs to clear the customs duties. But in the end probably the same cost as you would expect if you pay the extra luggage charge ($100 US per piece of luggage.)

Your products are sold for profit so this would simply be a cost of doing business. Yes it sucks, but it is the best way to guarantee you can meet your deadlines.