my biz partner lives in Costa Rica. It hasnt been cheap in about 7 years. It used to be. You can live in a nice climate similar to San Diego but with more rain if you live inland near the capital but its a city. Living near the beach is almost as pricey as here. The further out of town the cheaper it is. Electricity and internet are spotty and go in and out even on a daily basis.
Medical care is top notch and extremely cheap compared to the U.S. There are also healthcare plans you can get as an Expat to make it even cheaper. Weather is incredible expect during Fall when its the rainy season and it rains much of if not most of the time on and off. Locals are usually well educated and have a higher literacy rate than the U.S. and mostly friendly but you can run into trouble if you meet the wrong people and you may find yourself on your own without help from the lawmen.
If your looking for low cost living most people have to go to Panama, Nicaragua etc now.. Costa Rica’s cheap days are well over and done.