Omio is a great place to book train and bus tickets worldwide (and ferries, too).
They are currently offering several discount codes:
Use the discount code SUN10 to get a 10% discount on train, bus, flight, or ferry tickets until July 14. (On purchases up to 100 Euros. This offer is only valid for new customers.)
Use the discount code JULYSAIL24 for a 10% discount on ferry tickets until July 10. This offer is valid for any customer, new or returning and is valid for purchases up to 100 Euros.
Jul 2, 2024 - Jul 14, 2024