When it's a rare 50-dollar bill worth thousands of dollars! Don't plunk down that 50 to pay for dinner until you take a ...

The bill itself might be worth a lot more than two dollars — enough to build some serious wealth. Certain $2 bills can fetch $4,500 and up on the collectibles market, according to the U.S ...

While there's no 20-dollar bill serial number lookup to help you spot the ones that add value, there are a few things you can ...