You might want to consider distributing your books at the huge truck plazas.   

A couple months ago I found some short comedy books by an author at a truck stop in mid Oregon. I noted the author, Ben Goode, so I could check them out when I arrived home.  He is a local Oregonian and I found it awesome that they gave him a prominent shelf for all his titles.

A few days ago I was in Idaho and stopped for a burger at a roadside joint.  On the tables, in the little wire rack where the menus go, were dog eared books. Ben Goode's comedy books. Three or four on each table to read while you're waiting for your meal!  And if course copies to purchase on your way out.

Another good trick to create buzz about your self published books are to call bookstores, grocery stores, and wherever you want them to appear. Make a list and call each store twice a week and ask if they have that title in stock. After enough phone calls they will stock a few copies ;)

Just something to think about...