Where to buy ShaderX & ShaderX 2?

I know these books are probably very outdated, but I think they would be useful to fill in some gaps in my shader programming knowlege. I was also impressed with the content in the sample chapters that can be acquired from the ATI developer website. Unfortunately, they are not available on Amazon. Where can I find a copy of these books? I do have ShaderX 3,4,5.
 
You can try sending an email to Wolf, if anybody knows its him
 
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