I placed an in-store pickup order for this when I saw this post about a half-hour after it was posted. After waiting over five hours for the "ready for pickup" e-mail, I called the store. They couldn't find the order by my name but saw it when I gave them the order number. She said she saw that the order was placed on the site, but Walmart.com hadn't sent the instructions to the store to fulfill the order yet, and gave me a phone number to call at Walmart.com
A woman I spoke to there told me that it can take up to eight hours for an in-store pickup order to be processed and that I should give it time. I said I was worried about the fact that there were only four copies left in the store (via Brickseek, but I didn't say that) and I didn't want it to fly off the shelves before the picked it. She said not to worry. Not wanting to take a chance, and not able to get to the Walmart I did the in-store pickup at tonight, I instead drove to a different Walmart that was closer. They had four copies in stock behind their glass. I got a guy to get me a copy (he had to try multiples because only one copy out of the four wasn't a loose disc) and brought it to the register. It rang up $19.93 or something, but I didn't even need to say anything about the price on the site, he just tapped a few buttons on the register and I saw the price change to $9.99.
I then tried to cancel my in-store pickup through the app and it refused to let me cancel. Told me there was a problem, to refresh and try again. Kept doing it. So I called the Walmart.com number back. A different woman from before tried to cancel it for me and her system wasn't letting her do it either. I told her to forget about it and I'll just cancel it at the store when they notify me that it's ready for pickup. I then went to the movies with my girlfriend, and when I got out and turned my phone on, I found an e-mail from Walmart.com that was sent about three hours after I hung up with them.
"Items have been canceled from your order. We're sorry, but the items shown below are all out of stock. Since we don't known when we'll get them in again, we've canceled the items from your order and won't charge you for them."
So yeah, finally did get it, so that's a plus. But nothing went right at all with the order and glad I just went to the store and grabbed it myself.