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Website: Kayak.com

About: The genius of Kayak is convenience: it searches hundreds of travel sites at once. Kayak also allows users to view at a glance the cheaper days to buy the same flights, among other handy features.

Recent Deals: An April weekend flight from NYC to New Orleans for $222.

Honorable Mentions:Travelzoo has long collected travel deals for the masses. More recently, numerous private sale sites like Bloomspot offer vacation packages to resorts and high-end hotels, and TripAdvisor just launched Snique Away,which has the benefit of integrated TripAdvisor reviews.