You are allowed $300 U.S. per person on new stuff and unlimited on used stuff for your personal use. They are X-raying ALL the luggage now as you are going through customs. So, for a couple, you can be charged duty on anything over $600. Duty is around 11% across the board. I find that if I am carrying a lot of items, I just go to the declare section, take my receipts and pay. And they NEVER search me, so consequently, I never declare everything, just enough. If you pay the duty in U.S. dollars, then you will screwed on the exchange rate, so I always make sure I have pesos for the return trip. I tell them, "Yo viva Y trabajar en Belice" (I live and work in Belize) Practice your spanish phrases before you go.