Those dollar bills in your pocket may be worth more than you think.
There are people willing to pay cash -- for money. The folks at Cool Serial Numbers are looking to buy and sell paper money with cool and unusual serial numbers.
For example, a $1 bill with the code 00000001 could fetch thousands of dollars. If it is followed by a number two instead of a one it could be worth $2,500.
One of the new $100 bills, which roll out in October, with the serial number 00000001 could bring $10k to $15k.