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If you're already a Citi cardholder, you may have heard of a free service Citibank provides called Citi Price Rewind. I'm a bit embarrassed to admit that I've used Citi credit cards for a long time, yet I had never heard of this card benefit until a few months ago when I saw it advertised on Citi's website. If you aren't familiar with the service, here's how it works: