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No, it's not, that's quite an expensive time.
It's unfortunate how people on here don't appear to be able to put a series of words together to ask a question that people can understand.
Are you looking for a cheap holiday on the costa concordia from the 21 december for 8 nights or are you asking what's the cheapest cruise on the 21st December?
It is Christmas - the words 'cheap' and 'Christmas' don't go together...especially at this late stage.