Time to add (allow) Mexican postal codes to the website as many, many Canadians travel to Mexico for their holidays. Not even including all us ex-pat "Gringos"!
If'n ya don't know, it's best to come down with your $CDN and exchange for $MXN (pesos) down here in Mexico. Better exchange rate!! And you don't lose by having to exchange to $US then to $MXN.
It would help keep the website alive even more and also allow for a few more "travels".
Some Canadians while down on holidays will even exchange their $MXN for $CDN just before leaving so that they have some $CDN for when they arrive back home ( to pay for taxi, coffee, meals, etc).