If your books are about helping people or not but a good place to start iflocally, you could contact your local news and newspaper. try the "Local author's new book avilable" alant. Also send a link to your book as well. You can even ask if they would like to do an interview. I work for a TV Station and sometimes we have slow news days and use "Human Interest" stories to fill time.

Also you can search the archives at http://www.frugalmarketing.com/marketingtips.shtml

Best of luck