Tim,
I was a reverse benefactor to half price books once. I had three copies of Whitten's "The Golf Course" and decided to give one away here, keep one, and sell one to HPB. I mistakenly took one of my autographed copies - not only Cornish and Whitten, but about 100 other architects, Jack Nicklaus and Arnold Palmer included.
Someone bought a book that was a lot more than they bargained for!
Niall Hay was the first to respond and I will be sending him the book shortly......no autographs in this one, I checked!