Try this site - haven't ordered anything yet, but looks interesting. There's also a good selection of midi tunes on one of the adjacent pages.

members.aol.com/kitchieboy/timelytunes.html

What are some of the fiddle tunes you play for that period ? We've got Lewis & Clark bicentennial events coming up in the next couple of years here in the Northwest and can use all the tunes from 1800 - 1806 we can find.