Charlie Francis is a pdf download for $16.99 at
www.CharlieFrancis.com
Fundementals ($23)[and all the other Russian Translations] and Science and Practice ($37) are at Dave Tate's site
www.elitefts.com. Dave usually knocks a couple of bucks off of the amazon price.
I wouldn't waste my money on the Yessis or the Hatfield books. I have seen the Yessis book in the bookstores...it's a turd. I have also purchased 3 different books by Yessis in the hopes that something of significance would jump out at me. There is better info in S & P than the Hatfield book.
Keep in mind that Mel Siff's Supertraining contains a great portion of all the Russian texts, Zatsiorsky, Louie, and many others in a little more understandable format although Dr. Siff could be a bit challenging as well. If you don't have this book. Get it first.
Bill