Regarding finding books with personal inscriptions...
I found this in book on Billy Wilder in a charity shop, and couldn't bear to buy it after reading this.

(Not sure how well the image will turn out, but it says:
Darling Andy,
You are my Jack Lemmon, William Holden, Tony Curtis, Fred McMurray - How could I ever be bored with you? Enjoy this book - Your favourite film director. N - )