A used copy of the last edition of Production Fly Tying will cost a small fortune, but you can pick up a used first edition for a lot less. The books mentioned are fantastic. Do you have a Kindle? From time to time fly-tying books are offered for free on Amazon. I check for free books every day.
BTW, The Fly Tier's Benchside Reference is truly the bible of fresh water tying, but the book is expensive, so I bought the cd version for a lot less.
Randy