There is no single price tag. The cost of EPLAN depends entirely on you buy it (Perpetual vs. Subscription) and what you need inside it (Base modules vs. Add-ons).
The price varies significantly depending on the "modules" you add to the base platform.
Unlike cloud-native tools, Eplan (especially Pro Panel) requires high-end workstations (64GB RAM, dedicated GPU) and a robust SQL database server for multi-user access.