https://www.cnet.com/news/black-friday-iphone-deals-2018-save-150-on-iphone-xr-xs-snag-a-400-iphone-x-gift-card-best-buy-10/

You'll pay full price for the iPhone X, iPhone 8 or iPhone 8 Plus, but a $400 gift card is hard to pass up if you're a frequent Walmart shopper. You'll need to activate through AT&T, Sprint or Verizon. 

In-store only: Nov. 22 at 6 p.m. through Nov. 23. Schedule an activation appointment at 6 p.m. Activations begin at 8 p.m.