Here you can look for good prices on cruises for your family: www.uniworld.com Also, this site was awarded in 2010 for best cruises: www.avalonwaterways.com
River cruises can be bought from the Uniworld Boutique River Cruise site. Examples are European river cruises, Mekong River Cruises, Nile River cruises and Yangtze River cruises.
You can book cheap European cruises from websites such as Travelocity and Expedia. Another website you may be interested in is European River Cruises.
Avalon Waterways has vacation packages dedicated to European river cruises on their main website. River cruises include destinations to the Danube, the Seine, the Rhine, and other locations.
I believe you are looking for Avalon Waterways. In Europe they offer award winning river cruises through Austria, Croatia, France, Germany, and Serbia...just to name a few! Check out more details and see all Avalon's European river cruises on their website at http://avalonwaterways.com/Cruise-Vacations/River-Cruises-Europe/
There are several companies that offer Danube cruises. Try Viking River Cruises (http://www.vikingrivercruises.com/regions/europe/rivers/danube/about.aspx), Avalon Waterways (http://www.avalonwaterways.com/Cruise-Vacations/Danube-River/), or Euro River Cruises (http://eurorivercruises.com/Destinations/danube.htm).
There are many good cruise lines that offer cruises to European cities. The prices will depend on where you want to cruise to and when you want to go.
It depends on the company you are booking the cruise with. Right now I know Avalon Waterways is offering some specials on their 2010 Europe River Cruises, which can save you up to $1,000! Check out more information on their website: http://avalonwaterways.com/Special-Offers/2010-Europe-River-Cruises/
Nile River Cruise offers Nile River Cruises. Another company that offers Nile River cruises is River Cruises. Another company is Tauck River Cruises.
European cruises are short excursion over the cruise lines. They follow a predefined route involving good tourist destinations around ports. They also have good recreational facilities on board also.
Viking River Cruises was created in 1997.
Viking river cruises are river cruises that are offered in Europe, Egypt, China and Russia to name a few. I am sure that they would be a wonderful experience, but I believe that they would be extremely expensive for someone living in North America. You can find more information on Viking River Cruises here: http://www2.vikingrivercruises.com/?refsrcprg=sem
Viking River Cruises, Eqypt Cruises and Nile River Cruises are the 3 main companies in Egypt that offer cruises along the Nile. One can likely book these cruises from a travel website.