Limited inventory available but Norwegian has marked down some of it's upcoming unsold cruises.
A few examples:
Transatlantic starting from $39 per day
** 13-day Transatlantic from Miami on the Norwegian Jade starting from $499 per person USD, April 21 - May 4, 2018
** 12-day Transatlantic from New York on the Norwegian Breakaway starting from $549 per person USD, April 15-27, 2018
Panama Canal starting from $49 per day
** 11-day Panama Canal RT From Miami on the Norwegian Jade starting from $949 per person USD, Nov 26-Dec 7, 2018
Bahamas with Free Open Bar starting from $59 per day
** 4-Day Bahamas from Miami on the Norwegian Sky starting from $229 per person, March 19-23; Nov 26-30, 2018
And more...I cannot list all of them so just search your desired upcoming
dates and destination to see if there's anything marked down.