There is a $2 bill. Just try finding one nowadays. Apparently the U.S. Mint is still printing them, but it must not be issuing large quantities because I almost never see one. I think it's unrealistic to expect to be able to make $100 with 50 $2 bills, for example.
in reply to Re^3: puzzle: how many ways to make $100
in thread puzzle: how many ways to make $100
Just a total nit, but the US Bureau of Engraving and Printing makes the paper stuff in D.C.; the US Mint makes the coins in Denver and Philadelphia.
If you visit the USBEP, or their website, you can order as many $2 bills as you like, even in odd collectables such as uncut sheets of multiple consecutively-numbered bills.
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