Hi Marjorie,
Many local farmers’ markets, known as ferias, do have some organic vendors for produce and other items. Not super common yet, but it is getting better.
But there are also special organic-only ferias in some towns. For example, Escazu in the Central Valley and San Jose, the capital, have sizable organic farmers’ markets. San Isidro de El General, a large town in the Southern Zone, also is known for organic produce and such.
In some of the larger supermarkets you’ll find organic choices on the shelves. And there are also organic co-ops that deliver to your home in some areas. If you’re interested, if you live in the countryside raw milk and fresh eggs are also available. Just ask your neighbors.