Dr Christopher's book

Can anyone help me find the post that told where to find Dr. Christopher's book? It seems that it was a post by willowley and that she told which one it is that is authentic and not changed by his kids. I may be too late to get it. I remember that it was just a little below $100. There was also one on e-bay but the poster didn't trust that one b/c there was no image of the cover.

I have had it in my wish list(in my mind) and now want to get it for my birthday. Does anyone have this knowledge?

Thank a bunch.

nb