Walmart is going after Amazon Prime customers with a new free shipping offer
The retailer is offering a free month-long trial of its unlimited two-day shipping program, called ShippingPass, to new customers.
Walmart is also giving current ShippingPass members an extra month of two-day shipping, free of cost.
ShippingPass was designed to rival Amazon's Prime membership, which also offers unlimited two-day shipping - but for a $99 annual fee.
ShippingPass costs $49 a year, by comparison.
Walmart just recently shortened the program's shipping window from three days to two days, making it a more formidable rival to Amazon Prime.
Like Amazon Prime, ShippingPass gives subscribers access to more than 1 million products online that they can get delivered to their doors within a couple of days.
There's no minimum-order requirements to qualify for the free two-day shipping. The membership comes with free returns online and in stores.
The shipping changes are Walmart's latest bid to take on rival Amazon.
Walmart's online sales were $13.7 billion in fiscal 2015. By comparison, Amazon's online and electronic device sales in 2015 were $99.1 billion.
But Walmart has been slower than Amazon to offer fast and free shipping for online orders.
Without ShippingPass, Walmart customers have the option to choose between "rush" one-day shipping, which can cost at least $14 per item, or "expedited," "standard," and "value" options, which take between two and seven days and cost about $5 to $8. Walmart offers free pickup at stores.