I had an online chat with a Princess Representative. It was nearly identical to CruiserBruce and Heidi13’s responses. They require $300 in cash or travelers checks to be deposited with Guest Relations per person and they will inform you of a near zero balance. All casino charges can only be paid for by cash and no credit will be allowed. I will have a prepaid gratuities and drink package, so this will work out fine. Thanks to all who submitted an answer or opinion.