While driving around La Fortuna and the surrounding areas, we see vendors on the street selling various fruits grown in the area. We bought pineapples at this one. 4 pineapples / 1000 colones is about $0.41 each. Great price and they taste delicious -- a little sweeter and less acidic than the ones we had in the United States.
We also have a plantain farm a few houses away from our house. They cover the plantains with blue bags to help them ripen more quickly.