The fractional notes from this era are actually a lot scarcer than the coinage from this era, especially given their fragile nature, and that they actually saw some limited circulation up into the 1890's, my Grandfather had one that he showed me once that he saved from change ca. 1898 or so.
It is possible to get some of the more common notes in crisp uncirculated for under $75 if you look hard enough. They are fascinating, being the smallest currency the USA ever issued, and in fact, they were the first Federally issued paper money that most people saw during that time.