Queen Mary 2 Cruise Ship, Cunard Line.Read 43 user reviews and find great deals for Queen Mary 2 Cunard Line on Holiday Watchdog™. From cheap cruises to last-minute cruises, nobody beats CruisesOnly's prices and huge selection of cruise deals from today's top fleets. CruiseCheap.com is a high-volume, cruise-only travel agency that specializes in cheap cruise vacations. The secret to our cheap cruise deals is our buying power. We have cheap…