This past May we came in through Terminal 2 I believe and we were able to purchase duty free items post immigration at the baggage area/prior to customs. Our upcoming trip we are slated to arrive through Terminal 3 - anyone know if you can purchase duty free upon arrival in Terminal 3? Doesn't appear so on the map I was able to locate.
http://www.asur.com.mx/asur/ingles/aeropuertos/cancun/map.asp
Thanks!!