Rare $1 bills with printing error could be worth thousands: 'They're still out there'

If you’ve got a few dollar bills in your wallet, you might want to inspect the greenbacks before you spend them. 

Some U.S. coin and currency collectors are reportedly willing to pay thousands of dollars for rare $1 bills that have a certain printing error made by the U.S. Bureau of Engraving and Printing.

"It's very rare that the Federal Reserve would mess up an order, and then it reaches circulation," Chad Hawk, vice president of PMG, a professional paper money grading company headquartered in Sarasota...