If yes, by whom and how many?
Yes i have signed books:
Andreas Brandhorst: Das Schiff (The Ship)(Awesome book! I might do a review on it!)
Bernhard Hennen: Elfenlicht (fron The Elven series)
Thomas Thiemeyer multiple books
Michael Peinkofer multiple books
Wolfgang Hohlbein multiple books(probably the most signed books b/c I met him like 10 times xD)
(As you can maybe tell they are all German authors because it's more likely that I will them than any other nationality.)
I am not sure how many sign books I have but it's 10+.
I wish that i could meet some of the non-german authors whos books stand on my shelf and get them signed...