The easiest way to get a signed book from me is to get hold of Uncle Hugo’s bookstore, an excellent SF bookstore located about a mile from my house. They’ll take care of ordering it if they don’t have it in stock (though they probably will), and letting me know to go in there and sign it, and then they’ll deal with shipping. You’ll have to ask them about the exact details, but it’s probably the best way.
Uncle Hugo’s Science Fiction Bookstore
2864 Chicago Ave, Minneapolis, 55407