Just in case you're wondering, I finally found the Kentucky map postcards (I also found the new location of Napa Valley Grill and two new-to-me shopping centers, as well as a Tuesday Mornings I'd not run across before. Unfortunately, the doll I've been hunting down for a sweet little girl on our Christmas list was not there.).
Back to the map postcards: I found them in the only location I ever turn them up, which is on River Road across from the water tower that houses the Louisville Visual Art Association. Two gas stations nearly side-by-side out there both carry the good postcards, 4 for $1.00, map cards included. This time I bought 8, hoping they'll last me a little while.