(FILES) This December 31, 2014 file photo shows a Walmart store in Landover, Maryland. Retail behemoth Wal-Mart Stores will test a US program to provide unlimited delivery of goods for $50 a year in the coming months, challenging Amazon's similar service. Under the program, which will be tested in five US markets, Wal-Mart will ensure delivery of clothing, appliances, toys and other offerings within three days for online customers. The service will not include perishable groceries, Ravi Jariwala, a spokesman for the US retailer, said in a phone interview late May 13, 2015. AFP PHOTO / SAUL LOEBSAUL LOEB/AFP/Getty Images ORG XMIT:
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