Collectors and dealers say some old $100 bills are quietly trading for many times their face value, turning an ordinary trip ...

Most dollar bills really are just worth a dollar, but a tiny printing quirk on some notes has turned pocket change into a serious payday. The most dramatic example is a specific serial number mistake ...

Does the $2 bill seem like an oddball currency, seemingly rare in your everyday transactions and possibly a nuisance of a note you’d prefer to pass on to someone else? There may be some hidden ...