Walmart To Test A Free, Three-Day Shipping Service That's Half The Price Of Amazon Prime

 Walmart is preparing to test a new, unlimited shipping service which will compete to some extent with Amazon Prime, but at a lower price point of just $50 per year. The shipping service will be offered to select customers on an invite-only basis starting this summer, offering more than one million products for free delivery in three days or less. The company has not yet finalized what the…