According to Margaret Weis, Del Rey has made arrangements with a bookstore, Mysterious Galaxy, to sell copies of Dragons of Deceit that includes a bookplate autographed by both Margaret Weis and Tracy Hickman.
Per Mysterious Galaxy, “A bookplate is an autographed sticker that goes with the book. The book will not be directly signed. Personalization is not available for the bookplate.” You can see an example of the bookplate below.
“For those who would like a signed and personalized copy from me, you will be able to order from my website after Gen Con, starting August 15,” Margaret stated.