Found stock at my local Walmart. Tried to checkout, system shows "sale not allowed". Called the Orlando store that someone bought one, they immediately told me that product is "sale not allowed".
Don't get your hopes up. May have to wait until they allow the item to be sold. Also fuck Walmart for this bullshit.
Edit: Brickseek shows inventory for stores but it's not showing up on Walmarts website.
Other users experiencing same purchasing problem: https://www.reddit.com/r/Android/comments/546c8m/a_wild_xiaomi_mi_box_android_tv_appears_at/?sort=new
If you have success in buying it (again) post up in here, or if you see it pop up on Walmart.com
Edit 2: Rumor that release date is October 7th, per Walmart management/sales support.
Yeah fuck Walmart for honouring the release date.