how rare are united state notes?

Answer 1

Your question is very vague, so I will guess at what you mean:
United States Notes have a red treasury seal in place of the standard green seal on Federal Reserve Notes. Since 1928, they were issued in denominations of $1 (Series 1928 only, rather scarce), $2 (Series 1928, 1953, and 1963 - depending on date and condition, anywhere from very common to scarce), $5 (same as for $2), and $100 Series 1966 (Scarce - worth about $150 even in low grade).

Answer 2

?????????????