$100-dollar bills that could be worth up to $2 million

The most expensive banknotes in the history of the United States are these $100 bills that could be worth up to $2 million ...
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5 Rare 20-Dollar Bills Worth As Much As a Used Car

A twenty doesn't buy what it used to, but some rare 20-dollar bills can actually be worth a lot. Knowing what to look for can help you spot a bill that's special (and could be worth more than your car ...