Their policy is vague at best. It states that they will not honour pricing errors when it is obvious that it was an error. They actually changed to this several years ago after a slew of pricing mistakes that they honoured. There was one sailing in particular that they did not honour all the bookings people made at an incredibly low rate. I think it was on promenade cabins over thanksgiving IIRC.
In other words if you see an Oasis 7 day sailing on sale for $100 for a balcony I would bet that they would not honour it. In your case it is right there on the edge of just being a great deal vs being an obvious mistake