I know he's one of the most sought after but I'd still like to give it a shot.

Awesome! I'm a huge Beatles fan (I have the silhouette of Abbey Road tattooed on my arm!). Besides George Martin, are there any other people related to the Beatles that will sign?

I would love to get Tennant's autograph. But I have a question. I'm new to this (I created my account today). Since I live in the U.S., how would I pre-pay the postage for him to send back?