Sears.com, like most retailers, offers Guest Checkout—
But what they do that’s smart is that when Guest Checkout is selected they ask for an email address before revealing other fields–
This might seem like a small detail. But consider this: 20% of shoppers who reach shipping/billing page don’t complete the order. By capturing email address upfront sears.com might not guarantee a sale but they will capture an email address and can use email marketing to pitch to 80% of shoppers who didn’t place an order.