Earlier this week a friend asked if I knew a way to tell which Walmart stores had ebook displays. I didn't have a good answer for him at that time; this info is not explained clearly online, and when I called Walmart and asked, the employees had no idea what I was talking about.
While I still don't have a good answer for his question, I did find a way to mostly answer it. It turns out that there is a way to deduce which Walmart stores have ebook displays by looking at the Kobo section of the Walmart website.
First, select your local store from the "store availability" dropdown, and then look to see which Kobo models have “Free pickup today” mentioned underneath. If you see that label then it tells you that the store has them in stock, and very likely has an ebook display.
Right now it looks like the only model carried in stores is the Aura, though of course you can have other Kobo ereaders shipped to a Walmart store.
If you do stop by your local Walmart and look at the display, please let me know if it is as disappointing as the display at the Walmart nearest to me.