In Townsend Tennessee there is a fly shop called Little River Outfitters. It's the most complete flyshop I've ever found and the folks there are very helpful. If you are not near that area, Barlow's, Netcraft, both have fly tying materials in their catalogs. You can also do searches online for fly tying materials and get other good results.
Mac10 is correct, when it comes to fly tying Little River Outfitters has it all and the owner operators are extremely helpful in person or on the phone. they have a web site which lists their toll free# and an on-line catalog http://littleriveroutfitters.com/
The materials displayed on the Tackleunderground Web site, including without limitation all editorial materials, informational text, photographs, illustrations, artwork and other graphic materials, and names, logos, trademarks and service marks, are the property of Jerry Goodwin Inc. or its parent companies, subsidiaries, divisions, affiliates or licensors and are protected by copyright, trademark and other intellectual property laws. You agree not to reproduce, retransmit, distribute, disseminate, sell, publish, broadcast or circulate any such material to anyone without the express prior written consent of Jerry Goodwin Inc.