Hey, I heard a great idea about putting Reagan's mug on currency. The suggestion was to reintroduce the $500 bill and put Reagan on it. Perfect. Then his favorite people would get to see him whenever they needed inspiration.

By the way, I found this on the US Treasury page about discontinued denominations:

United States currency notes now in production bear the following portraits: George Washington on the $1 bill, Thomas Jefferson on the $2 bill, Abraham Lincoln on the $5 bill, Alexander Hamilton on the $10 bill, Andrew Jackson on the $20 bill, Ulysses S. Grant on the $50 bill, and Benjamin Franklin on the $100 bill.

There are also several denominations of currency notes that are no longer produced. These include the $500 bill with the portrait of William McKinley, the $1,000 bill with a portrait of Grover Cleveland, the $5,000 bill with a portrait of James Madison, the $10,000 bill with a portrait of Salmon P. Chase, and the $100,000 currency note bearing a portrait of Woodrow Wilson. They were used mainly for transfer of funds between Fed reserve banks and discontinued in 1969. Our current style of paper currency was created in 1929.

As a matter of interest, Salmon P. Chase served as Treasury secretary from 1861 until July 1864, and was Chief Justice of the Supreme Court from 1864 to 1873.