This article has links to a site called brickseek that uses the Walmart API for their inventory. This is awesome. Confirmed to be accurate for stock beyond any pre-orders, i.e. what is available for midnight purchases.
Some things I found interesting is that my local walmart will have stock of both Switch SKUs, pro-controllers and Zelda special editions. :)
Here are the direct links. open, then input your zip code to see stores nearest you.
Switch Gray:
http://brickseek.com/walmart-inventory-checker?sku=55449983
Switch Neon:
http://brickseek.com/walmart-inventory-checker?sku=55449981
Just Dance 2017:
http://brickseek.com/walmart-inventory-checker?sku=55404407
Gray Joy-Con Pair:
http://brickseek.com/walmart-inventory-checker?sku=55449975
Neon Joy-Con Pair:
http://brickseek.com/walmart-inventory-checker?sku=55449978
Joy-Con Charging Grip:
http://brickseek.com/walmart-inventory-checker?sku=55449979
Nintendo A/C Adapter:
http://brickseek.com/walmart-inventory-checker?sku=55449985
BOTW Zelda Amiibo:
http://brickseek.com/walmart-inventory-checker?sku=55449987
BOTW Archer Link Amiibo:
http://brickseek.com/walmart-inventory-checker?sku=55449989
BOTW Rider Link Amiibo:
http://brickseek.com/walmart-inventory-checker?sku=55449991
BOTW Bokoblin Amiibo:
http://brickseek.com/walmart-inventory-checker?sku=55449993
BOTW Guardian Amiibo:
http://brickseek.com/walmart-inventory-checker?sku=55449994
The Legend of Zelda: Breath of the Wild:
http://brickseek.com/walmart-inventory-checker?sku=55432568
BOTW Special Edition:
http://brickseek.com/walmart-inventory-checker?sku=55432569
1-2 Switch:
http://brickseek.com/walmart-inventory-checker?sku=55432570
Pro-Controller:
http://brickseek.com/walmart-inventory-checker/?sku=55485228
