I don't know about the logistics of getting the sticker if you pre-order, but I'm pretty sure that anything you buy in advance does get charged at time of purchase. However, here's what I'd do (have done and will do again!): send myself onboard credit in advance. This gets charged by Princess to your credit card right now and then you have that amount already credited to your shipboard account when you board. So you can "pay" now for that soda sticker and not worry about actually "buying" it until you're on the ship and confronted with the first of the 1,657 waiters who will try to sell it to you! Sending oneself advance onboard credit is one of the cleverest hints I've ever gotten from my fellow brilliant CCers.
New to Princess - Coffee and Soda Cards
in Princess Cruises
Posted
How do you pay onboard credit in advance?