I was on hold for over an hour, and then the gentleman with whom I spoke spent about 45 minutes answering all my questions. When I first called, I was #23 in the queue.
Phone number I used is (800) 446-6620. I believe they answer calls from 9 am to 6 pm, eastern time.
The agent seemed entry-level to me, although certainly very nice. But for this reason, I am not 100% confident that what I’ll tell you now is 100% accurate.
The only Crystal Society benefit he could confirm was that CS members pay 15% deposit rather than 25%.
He did not know anything about paying early to get a discount.
From the one example I asked about, single supplement for a veranda sounds quite high. The double veranda stateroom total was $8800, while for a single, that stateroom with veranda is $7400. The single stateroom, forward on deck seven, is $4800.
If you book and then change your mind on that specific cruise, even if just applying your $500 advance deposit, there will be an administrative fee of $125 per person, which cannot be refunded but can be transferred to a different booking.
I do think/hope he has the most up-to-date info at his fingertips.
YMMV