When I expandedmy collection into Federal reserve notes I stumbled into the Web Notes and that was interesting first the proces and then the problems and then the rarities. Very set of notes by far.

Web notes tend to be of interest to a few collectors, asking dealersat shows for them they tend to be lackng but you can find a few in Banknote Reporter and on the internet, APD Currency has an extensive list of notes. That should give you a good start. The frequent dealer at a show reply is "I only can bring so much to a show and that is not a high priority item."