As you become more successful as a writer, you often need to find sources for things such as bookmarks or postcards that advertise your latest book. Here are a few recommendations of site where you will find good suppliers for such products:
www.digitalroom.com - Printing of postcards, business cards, etc.
www.iconix.biz/bookmarks.htm - Printing of bookmarks
www.overnightprints.com - Printing of postcards and business cards
www.marbruco.com - Printing of Author Review Copies (to send out for promo purposes)