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Bank of America has ShopSafe which allows you to generate a temporary credit card number to use with the sketchy online merchant that has the particular gadget I want to buy.

Their implementation leaves much to be desired, but it's a step in the right direction.

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Discover card has gone back and forth on this. They had a tool on their site to give you a throwaway CC #. I used it for almost all online purchases. It went away for a short time, then came back. Now it looks like it is gone for good. I quit using their card since that was the only reason I had to use it over others.

Now if they'd only stop sending me "checks" in the mail that are tied to my account... I'm just waiting for those to be spent by someone else.

Last I checked this was also only offered for credit cards, not their debit cards :(

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