As of now, truly unlimited data eSIM plans for Costa Rica are not broadly available from most providers. While some plans offer significant data allowances, they typically have high-speed data caps before throttling, or are marketed as "unlimited" with fair usage policies. Providers like YeSIM and GigSky do offer eSIM options for Costa Rica, but their "unlimited" offerings usually pertain to data at reduced speeds after a certain threshold.
For travel to Costa Rica, it's common to find eSIM plans that offer large data packages (e.g., 5GB, 10GB, 20GB) which are often more than sufficient for typical tourist usage like navigation, communication, and light browsing. When searching for a Costa Rica eSIM, it's crucial to check the specific high-speed data allowance rather than just the "unlimited" tag to ensure it meets your needs.