Walmart has a new weapon in the grocery delivery wars against other top e-commerce rivals. Walmart online shoppers can subscribe to a $98-per-year “Delivery Unlimited” plan that aims to siphon customers from Amazon’s Whole Foods and Target’s home delivery programs. Online grocery shopping is growing steadily as a key revenue generator and customer draw. The food division was critical in boosting Walmart’s e-commerce performance in Q1. Delivery Unlimited is an expansion of the company’s existing store pickup and home delivery offerings.