"Walmart's e-commerce sales growth in its U.S. business slowed to 23 percent during the fourth quarter, a sharp decline from 50 percent in the third quarter. It noted last year's results got a big boost from its acquisition of online retailer Jet.com."
http://www.chicagotribune.com/business/ct-biz-walmart-earnin...
I think that would be expressed as an option for "combine my shipment with a bunch of others going to my neighborhood until there is a full tractor trailer load, or 30/60/90/120 days elapsed, and pass the savings onto me", because ground shipping is already available and about the slowest available standard shipping. Solving that logistics problem would be a strategic advantage, as it becomes a hairy optimization problem but with big savings over time, and offering this option opens up supply chain planning strategies that are now closed to us.
They raised prices for online orders. Now stuff you buy online is not the same price as you get in the store, I used to buy a lot of stuff from them for delivery, now I don't.
I personally wouldn't mind slower shipment and lower prices. But I guess that's a hard sell in today's world.