With Best Buy and Target promising price-match guarantees against online competition, and Amazon.com (NASDAQ:AMZN) now collecting sales taxes in more states, "showrooming" might officially be over.

At the same time, eBay (NASDAQ:EBAY) and Wal-Mart (NYSE:WMT) are testing out innovative new delivery options in their fight against Amazon. The Motley Fool's Alison Southwick asks contributor Demitrios Kalogeropoulos for his thoughts on the brewing same-day-delivery battle, and on which companies seem best positioned to deliver the goods.