If you are interested in postcards for your book promotion visit this site.
All you would need to do after visiting the link above is upload your cover image on Zazzle then add your address with their text tool on the back side of the card. I also suggest adding the site address where books can be purchased. You could even include a business card and write a simple message on the card when mailing like "take a sneak peek at my new book" or something to that nature. The cards are cute and they give people an idea of what your book looks like.
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Author/Publisher Victoria Sheffield