A printing error made around a decade ago resulted in millions of $1 bills with a rare misprint. Here's what to look for.

Although low-profile wallets are designed to accommodate US dollar bills, I've found they can still ... with a slide for storing paper money, up to two extra cards, and whatever else you need ...

Learning to spot the most valuable 10-dollar ... wallet right now, it's still fun to know what makes them worth so much. These are some of the rarest bills of all time. When collectors classify ...