The cost of a beer in Costa Rica will vary depending on a number of factors, including the type of beer, where you are buying it, and whether you are in a tourist area. In general, you can expect to pay between 1000 and 2000 Costa Rican colones (CRC) for a local beer, and between 2000 and 3000 CRC for an imported beer. This is equivalent to approximately $1.50 to $3.00 for a local beer, and $3.00 to $5.00 for an imported beer.
It is worth noting that prices can vary significantly depending on where you are and what you are looking for. For example, you may pay more for a beer in a tourist area or at a high-end restaurant than you would in a local market or grocery store. It is also worth noting that prices for alcoholic beverages can be higher in Costa Rica than in some other countries.
Overall, it is a good idea to be aware of the costs of things like beer and other basic necessities when planning your trip to Costa Rica, and to budget accordingly.