Amazon to offer same-day delivery?[ Fri, 13 Jul 2012 17:47:49 EDT ]One of Amazon's biggest advantages over local stores and mega-chains like Walmart is its lack of sales tax in most states. People can hop in a car and go buy a product from a local store immediately; or they can pay less, make the purchase quickly from a computer or smartphone and wait for the product to be shipped to their doorstep as soon as the next morning.