Travelling between and around German cities is set to become cheaper than ever this summer when places like Berlin, Munich and Hamburg begin selling monthly passes for the historically low price of €9 ($9.73) in June. Buses, trams, subways and trains in major German cities are to be covered under the monthly pass, valid in June, July and August. Regional trains taking travellers between cities and towns are also part of the deal, but inter-city travel with the country’s high-speed ICE rail services will still require a separate ticket. In what officials say is a one-time-only experiment, Germa…