I have already done this. The Walmart web experience is miles ahead. Amazon customer service has declined, where I have never needed to contact Walmart customer service for web orders.

I wonder how long it will take people to see this, but Amazon prime really isn't the proposition it once was. If you ask any Amazon employee they will tell you that you get free shows, music, books, etc. But I just want my orders to show up at my doorstep in two days. As you said, this is incredibly hard to do with Amazon prime in its current state.