Walmart has done amazing work at improving their online shopping experience to rival Amazon. Lots of stuff ships free 2-day shipping with no membership. Almost everything else is free shipping to either a Walmart or Neighborhood Market. To my knowledge there's no issues of fake products from Walmart.

Free shipping to their grocery store (Neighborhood Market) is the best deal for me. I can order my groceries for "pickup" so I just park in a designated spot and someone brings my groceries. While I'm there I pick up my regular packages. And if there's a problem, you can return to a physical Walmart where there's at least a human to talk to.