You need to be phoning the number at the top of the page.
A two night cruise ??? i think you need to be looking at a cross channel ferry !
Check out the Fred Olsen web site. 2 Nights on the Black Prince Sat 8th November 2008. Itinerary Greenock, Dublin, Liverpool for £111 when I was looking at this about a month ago the rail fare to Greenock was quite cheap and if I remember correctly they were running coaches from Liverpool to various drop offs for £20. contact 01473 746175.
On reflection if interested I would inquire of cabin availability and cost early tomorrow morning, with it only being £111 there may be quite a few checking availability, including me.........Only a couple of weeks ago I believe a Fred Olsen ship doing the reverse Itinerary Liverpool, Dublin, Greenock did not leave Liverpool as the Irish sea was so rough. Apparently everyone had a great time.
P & O do several 2 night party cruises from Southampton on each ship per year. I have been on Aurora and Ventura and had a great time. Check the pocruises website.