I finally was able to get this. Turns out there was at least one Walmart in the state that had any copies, in Walterboro. Some family friends and my wife and daughter and I were going down to Hilton Head today for some shopping and stuff and I remembered this thread and checked Brickseek. A Walmart along the way in Walterboro had some copies, so I hopped off the highway for a couple minutes and ran in and got one. Glad I did too, because my daughter and I swung by the toy isle and we found a Shopkins Season 5 mega-pack that rang up for $14.99. Those usually run me $25 or so on Amazon after the initial hype of a new season dies down, so my daughter was absolutely thrilled.
EDIT: But yep, deal is still live if you can find a Walmart with it in stock. Glad I finally got a copy and can play it. This and Fire Emblem were the 3DS titles that I was kicking myself for not getting before they went OOP and I managed to get both at sub-MSRP this year.