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Princess Cruiseline gift cards being sold for $ 460 for $ 500 value. These can be had at these price fairly regularly on AARP, but you need to be a member these days. Newegg has them $ 40 off $ 500 today only. Limit 5.
These can be used to pay for cruise fare/taxes. You can’t prepay tips with them, however, you can present them at customer service once on the ship to also cover gratuities.