Expat
Focus: Move to Costa Rica Easily provides information and resources
for a large number of countries, including Costa Rica, with articles on a variety of subjects to inform you about what is involved in moving to country and trying to make it easier — not an easy task.
Justlanded: Costa Rica provides forums, guides, job postings, housing, and classifieds for expatriates.
Numbeo: Cost of Living in Costa Rica is a fine crowdsourced site that provides much aggregate and itemized information about the cost of living in the country, the main cities, and bigger towns which should help prepare you for the transition.