Feather Craft in St Louis sells there own furled leaders. I am sure many of the local fly shops as well. Most come with a loop. I loop to loop mine to the fly line, then loop to loop tippet to the end of the furled leader. Easy way to change tippet when it begins to shorten. You'll like furled leaders, either thread or mono ones, as they lay out perfectly supple. Another source for them is a friend of mine Robin Rhyne. He furls leaders for sale here http://www.robinscustomleadersandflies.com/order.htm
Dano