Online car-insurance retailer Esurance is launching a pilot program on Friday to market coverage within 150 Illinois Wal-Mart stores. Esurance, which Allstate Corp. bought for $1 billion in 2011, is setting up unmanned kiosks at which shoppers in the world's biggest retailer may pick up a savings card to buy coverage. Customers may then use a code on the card to get a discount on car insurance.