We also have to remember that Walmart doesn't give two hoots about what BITOGers think of their oil selection. Their oil aisle is a tiny fraction of their total sales, and we are a tiny fraction of their oil sales. There's a reason there are a billion choices of 5w-20, 5w30, and 10w30 in Walmarts.
If your Walmart doesn't sell what you want or at the price you wish to pay, shop elsewhere. I'm sure there is a SOPUS distributor somewhere nearby that would be delighted to sell you QSUD 0w-20.