Best Buy, Walmart, and Sam's Club are delaying sales of iPhone 5 preorders to some customers, MacRumors notes. One person says that they received an email from Best Buy warning him that he wouldn't have his phone today, and that it might take up to 28 days before it's in stock. The person claims moreover that he was the first person to preorder a black 64GB model at his location, and that all of his friends got the same email.