Availability does seem rather limited. And prices highly variable.
I wonder why Princess is charging $1000 more for a balcony room (for 2) than Celebrity 15/14 night cruise. I have preferences for both (prefer the anytime dining, but prefer Celebrity overall) but for $1000, I'll eat when they tell me to eat and have one less day. Princess stops at Kauai, but that can't be the difference. Maybe its too early for the price competition.