With Best Buy and Target promising price-match guarantees against online competition, and Amazon.com (AMZN -1.65%) now collecting sales taxes in more states, "showrooming" might officially be over.

At the same time, eBay (EBAY 0.31%) and Wal-Mart (WMT 0.57%) 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.