https://techcrunch.com/2018/10/22/walmarts-marketplace-items-get-free-2-day-shipping-in-store-returns/

With Fulfillment by Amazon, marketplace sellers can make their products eligible for Amazon Prime’s 2-day shipping. Today, Walmart is catching up on this front. The retailer today announced it’s expanding its 2-day shipping to the millions of products offered by its own marketplace sellers. This expansion will roll out in the months ahead, alongside a process for simpler returns on marketplace purchases.

Walmart first launched free, 2-day shipping across millions of products back in January 2017, for orders that were over $35. The move was meant to challenge Amazon Prime, as all it required was a minimum purchase – not an annual membership fee.