Are there shops in your area that carry a variety of merchandise?
I am not talking about the big chains – Wal-Mart, K-Mart, etc. I am talking about a small Mercantile, a coffee shop, a rural town restaurant, museum store, gas station, quick shop, etc. if so, visit with the manager to see if they would be willing to purchase a couple of your books at a discount price to sell. While you are at it, ask if you can leave a small stack of your business cards near the book.
If they do not purchase your book, ask if there is a bulletin board where you can post your business card, bookmark, brochure, other items that tell about your book.