So far, this limited trial is kicking off with Uber in Denver and, according to Business Insider, Lyft in Phoenix. Rather than paying the driver directly, Walmart shoppers will be charged between $7-10 per delivery. The company is also testing a similar service with Deliv, out of its Sam's Club stores in Miami. Grocery deliveries are becoming a big deal, with firms like Target and Amazon hoping to elbow-out more established players in the market. The fact that Walmart is leveraging Uber and other ride-sharing companies is, in a way, a tacit indictment of its failure to get this going with this soon enough.