Travel agents. There used to be a lot of these. The few I see anymore cater exclusively to Mexicans (and as such, also do phone cards, money orders, taxes, etc. so they're not JUST travel agents). People used to do this for a living. It's all Expedia or direct booking with the airlines online these days.

As a side note, the only record stores left here are also exclusively for Mexicans (and also do phone cards, money orders, and do taxes... weird how that works, huh?). I'm going to come right out and say it: white people are bad for the local economy because they buy everything online!