Let them know you're going to be appearing on X date at X time at the bookstore. Be sure to include the bookstore's address in case the station decides to send out a crew to cover your appearance. Radio Television has the advantage of putting a picture of your book jacket on the air. But don't rule out radio. Work the news angle like you did for television.
People hold on to newspapers and magazines.
These publications are also passed along to other friends, family members, even on coffee tables at the doctor's office. There's more of a permanence to magazines and newspapers. If someone doesn't rush right out and get your book, they can always have that information right at their fingertips. Your Personal Web Site A Web site you can promote through your interviews and public speaking engagements is a good way to gain exposure. But don't make your Web site a blatant advertising message.