Silversea Cruises offers the best Alaska cruises because they use 382-passenger ships.
The best would be through the Alaskan Line. They have the most cruises. Although, many other do go to Alaska.
One can find find a lot of cruises to the outer banks of Alaska on online cruise agencies all over the internet. Examples are "Best Holiday Cruises" and "The Boat Company Southeast Alaska".
According to the Best Price Cruises website, the best deal for a 6 to 9 night cruise which will cost $499. Best Price Cruise is basically like Expedia, but for cruises.
Royal Caribbean or Carnival cruises.
Alaska Cruises can be found online or in TV ads, I am sure there are a bunch of opportunities for them. However most alaska cruises are good deals, they are very much worth your money.
There are great pices available at AlaskanCruise.com
You can find cheap alaska cruises at alaskacruises.com, the site offers special discount as well/
The best discounts on Alaskan cruises are for cruises leaving during the months of May and September. Alaskan cruises run from May through September. The most expensive times for an Alaskan cruise are during the warmer months of July and August.
Star Princess Cruises offer many great destination sites. Star Princess Cruises offer cruises for Alaska, Europe, the Caribbean, Australia, and many other foreign places.
There are several cruise lines that have ships that sale around Alaska. Among them are the Norwegian Cruise lines, Carnival Cruise lines, Princess Cruises, Celebrity Cruise lines, Royal Caribbean and more.
http://travel.travelocity.com/ecruise/Cruise/Alaska-Cruises is a great website so you can book trips to travel to Alaska and choose when to go to Alaska.