Expat Planners

The cost of living in Mexico City has gone up considerably but it's still less expensive to live there than in most US cities.

For Americans, it's hard to beat for : inexpensive, close, nice temperatures, cheap flights in and out, big community, and lots to do

There are no required vaccines for travelling to Costa Rica and most other Central American countries.
There are some recommended vaccines but be careful who's recommending them.