2nd class: Between $72-$95
1st class: Between $120-$232
These fares were found at
www.raileurope.com , but the price you pay at the train station could vary based on specials and that sort of stuff. This is a night train so if you want a bed instead of a seat, thats the higher price. The $232 is for a "Gran Clase Single", fully private compartment with private toilet and shower.