Ebay regularly has copies of all of his books available but they go for big prices. I got a copy of one of his books from Browzers Books in the UK (http://www.browzers.co.uk/) - an excellent source of decent books and good/quick service too. Racing and Sports is now using his ratings system and publishing the ratings for free so I assume any value to be gained from using them has now long gone. I found his books fairly interesting in any event, lots of food for thought without any need to slavishly follow the suggested methods.

Hope this helps