I agree that the Shows are a great place to start. An opportunity to meet and greet any number of famous and up and coming tyers. You can also search ebay, there are always famous flies offered there as well as on other fly tying auction sites. A google search may give you a location where your preferred tyer will be conducting a class. An article in the Fly Tying Magazines may also provide you with contact information.

You may also wish to post on the Wanted section on FAOL. There may be a member willing to sell or trade with you. Let us know how you make out.