Genoa to Barcelona ferry

http://www.grimaldi-lines.com/ is your best bet for a passenger ferry, but flying is usually cheap, if not from Genoa then from either Pisa or Nice.

Thanks!
Any idea how far in advance their schedule is available?
When I tried to check prices for spring I got an error, but when I made up a date next month it worked.

Laura, are you sure there is a direct line Genoa-Barcelona?, I've checked the website and it seems that this line is not served as such and Savona or Livorno are the closest ports linked with Barcelona. Maybe I'm not looking at the right place :))