Dave,
Got mine at the Sommeset show 3or4 yrs back from river road creations. http://WWW.RIVERROADCREATIONS.COM.
I got the mayfly wing cutters and really like them although it was a little tricky for cut hen wings. Just be sure to use the foam pad that comes with your kit.
JW
from each strip i then cut vertical strips, each vertical strip then is used for a hopper.
I then tie to shank and may trim head and but to round them off. I have not noticed any difference in productivity in square head/but vs. rounded head/but hoppers. It is a time saving vs. looks decision.