Buy tickets at ticket counters, it may be possible to buy on the train but the ticket will cost more International tickets are sold at separate counters. Foreigners don't qualify for student discounts on National services. Train guide Cestovny poriadok. BUS National SAD Domestic services are more expensive but often faster than the train. Sometimes you must buy a ticket at the station sometimes you must buy from the bus driver - very confusing.
Most cities have a cheap and efficient public transport system.
Buy them from kiosks, machines, newsstands. Warning Make sure you validate the ticket correctly, you may be fined if you stamp it 'upside down' Taxis Metered. Make sure it is on. Tourists are often overcharged. It's better to book a taxi at your hotel reception or by phone.