Unless you can find free-range, or cage-free eggs (and those are not guaranteed, there may not be any roos in with those girls) at Walmart, you probably won't get ordinary grocery store eggs that are fertile. You'd have a much better chance of getting fertile eggs at Trader Joe's, or at a health-food store. Some health-food stores carry fertile eggs, for eating. You can hatch them, if they aren't too old. Or maybe the organic/natural food section of a grocery store. Here, we have a chain called Kroger, they have such a section. I have not tried to hatch their eggs, as I have plenty of my own. Call around and see. Don't say you want to hatch them, though. Most folks in the stores won't have a clue whether you could or not, they'll probably tell you something, but whether they really know is questionable.
Shipping costs make mailing eggs to you impractical, but there are places almost everywhere that you can get a few eggs that will hatch. Do you know how to check the yolks to see if they're fertile? There's a sticky in the "Egg Laying and Behaviors" section, that has pics you can look at. Then if you check a couple from the dozen you buy, and they aren't fertile, you can look other ones, and just eat the infertile ones.
Shipping costs make mailing eggs to you impractical, but there are places almost everywhere that you can get a few eggs that will hatch. Do you know how to check the yolks to see if they're fertile? There's a sticky in the "Egg Laying and Behaviors" section, that has pics you can look at. Then if you check a couple from the dozen you buy, and they aren't fertile, you can look other ones, and just eat the infertile ones.