Well, no.
P&O has one, and not sure it is much better than the sale they have every month.
Princess has one, and I was all geared to get a recent booking repriced. Turns out we scored a better deal 3 weeks ago than what the Black Friday price is.
I am still looking, and I haven't spotted any deals for Carnival yet. Maybe when the US wakes up for black Friday there will be something.